Laserdistance Meter

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The essence of our confocal chromatic imaging principle is the accurate detection of colors from light that is reflected back from target surfaces. The white light is focused onto the target surface by a multi-lens optical system. These lenses disperse the light into monochromatic stages (colors) along the measurement axis. A specific distance to the target is assigned to each color’s wavelength in a factory calibration. Only the wavelength which is exactly focused on the target is used for the measurement. This light reflected from the target surface is transmitted from the probe, through a confocal aperture and onto a spectrometer which detects and processes the spectral changes and calculates distances. These distance measurements are transmitted at high speed via ethernet communications protocol.

201273 — I usually do this kind of stuff with 1.8K Arrisun or couple of 2K fresnels with lenses removed to get sharper beam :) ... Share. More ...

The Acuity AS1100 Long Distance Sensor can measure up to 100 meters on natural targets and up to 150 meters away with an Acuity reflective plate with an accuracy of ± 3 mm. This rugged sensor is built for versatile environments and is often used in applications that involve measurements on hot materials.

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SizeAdditionally, consider the size of the light: some are quite small and portable, which means you can take them on the road with you; others are larger and heavier, which may weigh you down.

Learn more about Acuity’s patent on modulated beam time of flight measurement instruments by reading the U.S patent 5,309,212.

As you might expect from its name, the Rotolight Ultimate Vlogging Kit is designed for content creators making videos or streaming to YouTube, TikTok and Instagram. With that in mind, it comes with a mini tripod that can turn into an extended camera grip: very helpful if you often switch between shooting in a studio and on the go.

Our favorite ring light overall is Neewer's 18-inch RP18B Pro, thanks to its great build quality and the included accessories in the box. It also features Bluetooth smartphone control, industry battery compatibility and a wide bi-color temperature range. However, if you’re on a tighter budget or simply need something different, you'll find something to suit among our picks of the best ring lights. All you have to do now is read on.

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Why not check out our other photography picks:It's important that your other kit matches up to your competent new ring light. Make sure you read our guide to the best cameras if you're thinking about upgrading kit. Already know which side you're taking in the mirrorless vs DSLR debate? You'll want to read our picks of the best DSLR cameras or best mirrorless cameras. On a tight budget? Make sure to read our picks of the best cheap cameras. You need to be a dab hand in the edit suite these days for your photos to stand out online, so make sure you read our guides to the best photo editing software and best photo editing apps. The same goes for video too, so consider finding out what we think is the best video editing software, best free video editing software and best video editing apps. Finally, all those photos and videos are going to need to go somewhere, so make sure you know all about the best photo storage sites if your drives are already nearing full.

We think the Neewer RP18B Pro is the best ring light you can buy. It’s more affordable than the Wescott 18-inch ring light below, while also offering a wider adjustment range of 2700-7000K, Bluetooth connectivity for lighting adjustment and FX options via the Neewer app, plus a sturdy metal stand which features a heavy duty metal locking cuff mechanism. There’s also a mobile phone holder included so you can place your phone in the centre of the ring light. It also comes with a ¼” thread ball joint adapter instead of the mobile phone holder so you can use this ring light with one of the best cameras for vlogging. The RP18B Pro also comes with a carrying case that features a near light stand compartment so you can keep everything organized on the move.

Much like the Logitech Litra Glow, we like the Elgato Key Light Mini because it offers a different path to illumination as a ring light alternative. Small and light enough to hold in your hand if you need to move and direct its lighting on your on, the Key Light Mini's internal 4000 mAh power supply lasts a while on a single charge (and charged speedily via USB-C in our testing).

The Logitech Litra Glow is small and requires less desk space than some of the larger options in our list, but on the flip side it's not something you can mount a camera or phone into the middle of for easy streaming on the go.

Infrared radiation · Far-infrared, from 300 GHz to 30 THz (1 mm – 10 μm). The lower part of this range may also be called microwaves or terahertz waves. · Mid- ...

Like Westcott and Nanlite, Godox has a good reputation for making quality lighting products. The LR150 is no exception, which is why it makes our list of the best ring lights.

The AS2100 is a highly accurate laser distance sensor that is designed to work well outdoors, in bright lights, and even on difficult targets such as hot or dark surfaces. With the ability to take accurate measurements (± 1 mm) from distances up to 500 meters away, and a measurement frequency of up to 250 Hz, it is the perfect laser for a wide range of applications.

The AR550 high speed laser sensor is Acuity’s fastest triangulation device for dimensional and distance measurement. At sampling rates up to 70kHz, these sensors are typically used for applications that demand high speed such as vibration measurements, scanning of roads, vehicle crash test, and ballistic measurements.

On the light itself, there are two knob controls to adjust the color temperature (3000K to 6000K) and brightness of the light. It comes with a power supply, but no batteries, which makes this more suited for studio or home scenarios. It also comes with a built-in USB port to keep your smartphone charged. A nice extra on this ring light is that it lets you rotate the light head 180 degrees horizontally. The included tripod stand, meanwhile, can extend up to 78 inches.

For distances of a few inches with high accuracy requirements, “triangulation” sensors measure the location of the spot within the field of view of the detecting element. Time of flight sensors derive range from the time it takes light to travel from the sensor to the target and return. For very long range distance measurements (up to many miles) “time-of-flight” laser rangefinders using pulsed laser beams are used. Modulated Beam Systems use the time light takes to travel to the target and back, but the time for a single round-trip is not measured directly. Instead, the strength of the laser is rapidly varied to produce a signal that changes over time.

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Triangulation devices are ideal for measuring distances of a few inches with high accuracy. Triangulation devices may be built on any scale, but the accuracy falls off rapidly with increasing range. The depth of field (minimum to maximum measurable distance) is typically limited, as triangulation sensors can not measure relative to their baseline, the distance between the emitter and the detector.

Modulated beam sensors are typically used in intermediate range applications, for distances from a few inches to several tens of feet on uncooperative targets. With cooperative targets, like reflectors, range can be extended to several hundreds or thousands of feet.

The AS2100 is a highly accurate laser distance sensor that is designed to work well outdoors, in bright lights, and even on difficult targets such as hot or dark surfaces. With the ability to take accurate measurements (± 1 mm) from distances up to 500 meters away, and a measurement frequency of up to 250 Hz, it is the perfect laser for a wide range of applications.

The AR700 laser displacement sensor is Acuity’s top of the line, most precise, laser triangulation sensor. The AR700 series contains models with measurement ranges from 0.125 inches up to 50 inches and resolutions as low as one-sixth of a micron. With sampling speeds up to 9.4kHz and linearity to within 0.03% of the measurement range, the AR700 is a versatile sensor for many challenging applications.

But while we're slightly annoyed by the fact that it doesn't come with a stand, tripod (we used one of our own in the above photo) or mount, its quite-strong magnetic back makes it truly unique. No matter where you go, you'll be able to adjust it on the fly. It works with Elgato Stream Decks for your home setup, but it's also adjustable on the fly (brightness and warmth) via Android, iPhone, PC and Mac devices. Some of the below ring lights are rechargable, but the Key Light Mini is that plus so much more.

One of our triangulation displacement sensors is patented and much can be learned by reading the patent (USPTO 6,624,899).

The AR500 is a compact triangulation laser sensor that excels in its versatility. The AR500 is available with measurement ranges from 5mm (0.2 in.) to 1000mm (39.4 in). The red or blue laser is available with an assortment of power options (from Class 2 to 3B) for applications that require a brighter laser. A factory installed internal heater, air jacket, or splash guard is available for challenging environments.

The AR100 is one of the smallest laser measurement sensors in the world. The ultra-compact AR100 comes with ranges from 10mm (0.4 in.) to 500mm (19.7 in.) with a single case size. It can take 9,400 measurements per second and has a linearity of ± 0.05% of the full measurement range for most models. In short, the AR100 is perfect for applications with tight size and mass budgets that can’t sacrifice performance.

This ring light has user-friendly controls and a hassle-free setup, and it claims to have high color accuracy. It also has a built-in diffuser which produces soft, beautiful lighting that fills in shadows on your subject's face with iconic catchlights in the eyes.

FeaturesDo you need a ring that lets you adjust the light’s color temperature or brightness? Or do you need the option of powering the ring light either by an AC adapter or using batteries?

We absolutely loved the Neewer RGB62 in testing. This compact portable RGB LED is super affordable at $26 and, as an RGB light, isn’t limited to only yellow or white like many ring lights (although it does have a bi-color mode with a very wide 2500K-8500K temperature range). It comes with a diffuser to soften the light and has an internal battery so you don’t need to plug it in. It also features four cold shoe mounts to give a wide variety of mounting options — you can mount this panel on top of your camera, then mount 3 more accessories to the light itself, or you can daisy chain several of these lights to make a more powerful lighting setup. You can also control it with the Neewer app which allows you to fully control the lighting, as well as assigning a range of effects, such as music synchronization. It also comes with a magnetic back, so you can simply clip it to anything metal without the need for a light stand.

Acuity’s most accurate and most resolute distance sensor employs a unique measuring principle, confocal chromatic sensing. Unlike our time-of-flight and triangulation sensors which use lasers, the CCS Prima Confocal sensors use a white light source to accurately measure the distance to surfaces. Some models are accurate to within 20 nanometers. Additionally, this technology permits measurement and profile of transparent materials like glass, lenses, liquids, etc.

As a studio light, however, the MS60C is expensive, so if you’re on a tight budget one of the ring lights above will be better suited. This light is aimed more towards burgeoning enthusiasts and serious content creators. It also won’t give you the trademark ring in your eye that you’ll find with actual ring lights, so if you’re shooting beauty content and want the ring light “look” this won’t be for you. Annoyingly, it doesn’t come with a stand or batteries, either, both of which are expensive.

This portable LED kit also comes with a 61-inch light stand, constructed from aluminum alloy, giving it exceptional strength. It also has a 360-degree rotatable smartphone holder, plus a Bluetooth receiver for controlling your ring light remotely. Oh, and it even comes with a handy carrying bag.

Use casesThink about how you want to use the ring light. Are you just capturing casual photos on your phone? Then, you won’t need to spend a lot of money. But what if you are producing a weekly video podcast or episode for your YouTube channel? Then, you’ll want to pay more for a ring light that gives you more options.

The AR500 is a compact triangulation laser sensor that excels in its versatility. The AR500 is available with measurement ranges from 5mm (0.2 in.) to 1000mm (39.4 in). The red or blue laser is available with an assortment of power options (from Class 2 to 3B) for applications that require a brighter laser. A factory installed internal heater, air jacket, or splash guard is available for challenging environments.

The Wescott 18-inch ring light does have one advantage in that it comes with NP750 batteries to run away from mains sockets. And while the RP18B Pro is cheaper than the Wescott, buying Neewer’s battery plate plus two NP750 or compatible batteries will take your total spend higher. That said, most people will be using a ring light in a home studio set up where mains power is reachable, so we don’t think this is a deal breaker, especially as the RP18B Pro offers better features all round. One slight gripe we had is that the screw handles for securing the ring light to its frame are made out of cheap feeling plastic, although the rest of the light and the tripod all feel very sturdy.

Acuity laser line sensors are frequently used in automation and quality control applications in order to measure and verify dimensions, detect flaws and defects, and/or identify target surface variations. Common application fields include steel and aluminum production, automotive, aerospace technology, electronics, robotics, and welding.

What’s nice about this ring light is that it’s small in size and lightweight, so it will fit into many pocketbooks, or even a jacket pocket. It comes with a USB micro cord, in order to recharge the unit’s battery. The manufacturer claims this ring light has a battery life of 1-5 hours.

PriceFirst, consider how much you’re willing to spend. The models in our guide give you rough estimate of the price range of ring lights, which can run as little as $6 or a much as $189. However, there are pricier ring lights available for more professional or specialized uses. For example, some models can cost as much as $500, but are extremely powerful and versatile.

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Confocal displacement sensors meet the requirements of the most demanding applications for dimension, thickness, or roughness measurement. These sensors can measure any type of sample (transparent, opaque, polished or rough) and any type of material (metal, glass, ceramic, semiconductor, plastic).

It runs on the included AC power adapter or, when you’re far from a power outlet, on the two included NP-F750 lithium-ion batteries. While the Neewer RP18B Pro can run on batteries, that light doesn't come with them included, meaning the Wescott is the better of the two for portability straight out of the box. The included batteries provide up to 70 minutes at full power, according to the manufacturer. It’s also fully dimmable and equipped with an adjustable color temperature ranging from 3200K to 5600K — this is a much narrower range than the Neewer RP18B Pro.

The best ring lights are a must if you're looking to improve the quality of your videos, whether you're streaming on YouTube or hosting a work Zoom call.

The Acuity AR1000 laser distance sensor can measure up to 30 meters on natural targets and up to 150 meters with a retroreflective target with an accuracy of ± 3 mm. This rugged sensor is built for tough, industrial environments and applications such as fill level measurement and material height monitoring.

Most will work with either cameras or smartphones (we've got a separate list of the best ring lights for phones if you're specifically interested in that side of things) and they're a great match for one of the best cameras for vlogging. Some also appear among our pick of the best TikTok lights.

Terry Sullivan is an experienced technology journalist who has covered consumer electronics including cameras, smartphones, audio tech and software among many other things. His work has appeared in the likes of Consumer Reports, PCMag, Lifehacker, and the New York Times and he is also a teacher, photographer, artist, and musician.

AR3000 distance measurement sensors are Acuity’s longest-range models. Ideal for measuring positions of cranes and trolleys, the time-of-flight sensor can measure up to 300 meters to natural surfaces and up to 3,000 meters when using a retroreflective target.

The AR100 is one of the smallest laser measurement sensors in the world. The ultra-compact AR100 comes with ranges from 10mm (0.4 in.) to 500mm (19.7 in.) with a single case size. It can take 9,400 measurements per second and has a linearity of ± 0.05% of the full measurement range for most models. In short, the AR100 is perfect for applications with tight size and mass budgets that can’t sacrifice performance.

This 18-inch Neewer ring light has a fixed color temperature of 5500K, which matches a daylight-balanced light source. However, it also includes two color filters (white and orange), made from high-light-transmission plastic, which allow you to easily switch temperature from 5500K to 3200K. There's also a stepless dimming knob, which lets you adjust the brightness.

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You get lots of options with this model: it can be used with a phone or nearly any type of stand-alone camera, since the kit comes with two cold-shoe mounts and a 1⁄4-inch-20 mounting option.

LaserMeasure

Acuity Laser’s ultra-compact rangefinder model. This eye-safe rangefinder has a measurement frequency of up to 40 kHz and can measure distances to natural targets up to 70 meters away or to retroreflective targets 270 meters away. This laser is best for applications that demand high sampling rates.

Although the RP19H is cheaper than the Neewer RP18B, it doesn’t feature Bluetooth connectivity or a wide temperature range like the more expensive model, so we think you should spend a little extra on the RP18B if you can. This ring light does feature decent build quality, however, and comes with a metal light stand (again this is not as sturdy as the stand that comes with the more expensive RP18B).

The AR200 laser measurement sensor is a compact, durable, and reliable sensor built for many industries including the lumber, medical and high-tech industries. The AR200 sensor consists of five different models with ranges up to 100 mm (4 in) and accuracies down to 6-microns to satisfy precise measuring requirements.

If you’re looking for a versatile ring light kit that has a professional build quality and provides you with lots of features and options, the Westcott 18-inch Bi-Color LED Ring Light Kit with Batteries and Stand will fit the bill. Westcott has a long history producing top-notch lighting equipment for pros, and is an excellent choice, whether you’re using it for vlogging, live streaming, capturing video or shooting still photos for portraits, food, still life and many other types of genres.

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There are several mounting options, including a tripod ball head, which lets you use a DSLR or mirrorless camera. Plus, you have the ability to mount up to five phones at the same time on this model. And as a nice extra, the back of the light comes in two colors — pink and black.

The AR700 laser displacement sensor is Acuity’s top of the line, most precise, laser triangulation sensor. The AR700 series contains models with measurement ranges from 0.125 inches up to 50 inches and resolutions as low as one-sixth of a micron. With sampling speeds up to 9.4kHz and linearity to within 0.03% of the measurement range, the AR700 is a versatile sensor for many challenging applications.

If you do want a ring light, with so many available at so many different price points, how do you choose which model is right for you?

Wavelengths of 3 μm to 1,000 μm within the infrared range of electromagnetic radiation (light) are known more specifically as far-infrared. Because many ...

The method used to measure distance depends on the accuracy and distance capability required of the device. Measurement principles include triangulation, time-of-flight measurement, pulse-type time-of-flight systems, and modulated beam systems.

Although this inexpensive ring light has a barebones design and feature set, it can be used on various mobile devices, including most phones and tablets, as well as on laptops. The model also lets you adjust the strength of the light’s brightness by setting it to low, normal or high.

The Zenith controller is a next generation solution for non-contact, confocal measurements. Paired with a confocal pen, the Zenith controller can take measurements of unrivaled accuracy on surfaces where lasers struggle. Depending on the confocal pen chosen, the Zenith controller can take measurements with errors as low as +/- 35 nanometers. A new Dual Channel version can support two pens for simultaneous, synchronized measurement perfect for thickness applications.

KC HiLites is your one stop for LED interior and dome lights. These versatile lights will allow you to see clearly inside your vehicle.

The downsides? The onboard controls can take a bit of working out, especially if you’re new to lighting. And while it’s powerful for its size, I’m not sure it’ll function well as a main light if your trying to shoot higher end content for socials or YouTube (unless you daisy chain two or three of them together with the cold show mounts). Still, on its own, a single RGB62 should be more than enough for video calls and would serve as a great secondary light to cast shades of color into the background of your frame.

However, for the price, it’s quite a useful selfie light that allows you to set the brightness at three different levels. It can also be used with a variety of devices, including a smartphone or laptop, which can be useful when you have a meeting and want to make the lighting look soft and natural. It’s ideal for those photographers who want to shoot casual selfies or video clips. It can also be controlled wirelessly.

The Acuity AS1100 Long Distance Sensor can measure up to 100 meters on natural targets and up to 150 meters away with an Acuity reflective plate with an accuracy of ± 3 mm. This rugged sensor is built for versatile environments and is often used in applications that involve measurements on hot materials.

The AR200 laser measurement sensor is a compact, durable, and reliable sensor built for many industries including the lumber, medical and high-tech industries. The AR200 sensor consists of five different models with ranges up to 100 mm (4 in) and accuracies down to 6-microns to satisfy precise measuring requirements.

Modulated beam systems also use the time light takes to travel to a target and back, but the time for a single round trip is not measured directly. Instead, the strength of the laser is rapidly varied to produce a signal that changes over time. The time delay is indirectly measured by comparing the signal from the laser with the delayed signal returning from the target. One common example of this approach is “phase measurement” in which the laser’s output is typically sinusoidal and the phase of the outgoing signal is compared with that of the reflected light.

AR3000 distance measurement sensors are Acuity’s longest-range models. Ideal for measuring positions of cranes and trolleys, the time-of-flight sensor can measure up to 300 meters to natural surfaces and up to 3,000 meters when using a retroreflective target.

These simple, donut-shaped devices generally use LED lighting to produce a diffused, continuous glow which makes you look your best on screen; unflattering shadows will be a thing of the past once you're using one.

The Zenith controller is a next generation solution for non-contact, confocal measurements. Paired with a confocal pen, the Zenith controller can take measurements of unrivaled accuracy on surfaces where lasers struggle. Depending on the confocal pen chosen, the Zenith controller can take measurements with errors as low as +/- 35 nanometers. A new Dual Channel version can support two pens for simultaneous, synchronized measurement perfect for thickness applications.

Lasertape measure

The Acuity AR1000 laser distance sensor can measure up to 30 meters on natural targets and up to 150 meters with a retroreflective target with an accuracy of ± 3 mm. This rugged sensor is built for tough, industrial environments and applications such as fill level measurement and material height monitoring.

One method for accurately measuring the distance to targets is through the use of a laser triangulation sensor. They are so named because the sensor enclosure, the emitted laser and the reflected laser light form a triangle.

Learn how to quickly calculate the beam spread of light at certain distance with our handy diagram! Popular beam spreads are already calculated for quick ...

For more please view our in-depth page on Laser Triangulation Sensors and for more fundamentals, you can learn more about triangulation at FierceElectronics.com.

Phase measurement is limited in accuracy by the frequency of modulation and the ability to resolve the phase difference between the signals. Some modulated beam rangefinders work on a range-to-frequency conversion principle, which offers several advantages over phase measurement. In these cases, laser light reflected from a target is collected by a lens and focused onto a photodiode inside the instrument. The resulting signal is amplified up to a limited level and inverted, and used directly to modulate a laser diode. The light from the laser is collimated and emitted from the center of the front face of the sensor. This configuration forms an oscillator, with the laser switching itself on and off using its own signal. The time that the light takes to travel to the target and return plus the time needed to amplify the signal determines the period of oscillation, or the rate at which the laser is switched on and off. This signal is then divided and timed by an internal clock to obtain a range measurement. The measurement is somewhat nonlinear and dependent on signal strength and temperature, so a calibration process can be performed in the sensor to remove these effects.

Acuity Laser’s ultra-compact rangefinder model. This eye-safe rangefinder has a measurement frequency of up to 40 kHz and can measure distances to natural targets up to 70 meters away or to retroreflective targets 270 meters away. This laser is best for applications that demand high sampling rates.

The QIAYA selfie ring light is the most lightweight of the products we looked at for this guide. In fact, it’s also compact, enough so that you can easily carry it around in your pocket. Overall, it has a very simple, straightforward design, but doesn’t provide a lot of options when you compare it to more expensive models.

The AR550 high speed laser sensor is Acuity’s fastest triangulation device for dimensional and distance measurement. At sampling rates up to 70kHz, these sensors are typically used for applications that demand high speed such as vibration measurements, scanning of roads, vehicle crash test, and ballistic measurements.

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The RP19H is the ring light to get if you need to shoot on more than one device simultaneously, as it has three cold shoe mounts. This means you can mount three smartphones or cameras for shots at different angles. This feels like a bit of a gimmick, as the space between the mounts is small, meaning the angles won’t be hugely different. Using three smartphones or cameras might be useful if there are a group of you in shot, though, as you can all record the same content on your own devices. You could use the cold shoes to mount an extra accessory like a microphone, though.

If you want to take your lighting to the next level, or you want to shoot more than just to-camera or vlogging content, you might well be better off investing in a proper video light. Look no further than the Neewer MS60C. This portable video LED is super powerful and will allow you to craft professional-looking sets. It’s RGB, so you aren’t limited to just yellow or white, can run off either mains or battery power, and comes with a handle for handheld usage, making it a very flexible and portable tool. It’s also pretty small for a studio light, as it doesn’t need an internal fan. As with other Neewer products, you can control the MS60C fully via Bluetooth through the Neewer app.

Acuity’s lineup of short range laser distance measurement sensors includes compact laser triangulation sensors. These compact laser triangulation sensors are ideal for tasks that demand high speeds, high measurement accuracy, and long standoff ranges for measurement on numerous targets. Our device offering includes features to satisfy your most challenging machine integration, factory automation, and component inspection applications.

With that in mind, the Logitech Litra Glow is more a tool for lighting your work video calls or Twitch streaming sessions than it is a full-fledged do-everything option — but within its ideal use-cases, it excels. Setup is super-simple and integration with Logitech's G Hub gives you full control over its functions. Better still, if you have a Logitech keyboard or mouse you can use them to turn it on and off, or change settings. It does a great job of lighting calls and never once gave us a headache in our testing, while its $60 price puts it squarely in the middle of the best ring lights.

Acuity offers a variety of laser distance sensors for accurate, non-contact measuring. These distance measurement lasers utilize pulsed time-of-flight measurement principles to accurately measure distances up to 300 meters on natural surfaces (up to 3,000 meters with retro-reflective tape). These products are highly versatile, being able to measure distances both indoors and outdoors. Applications include, but are not limited to, load confirmation, alignment, lumber positioning, crane monitoring, fill level measurement, velocity measurement and altitude measurement.

Firstly, you'll want to consider whether you want a ring light or a different type of light. Ring lights are the best for vlogging or beauty content, as they're primarily aimed at lighting faces. If you are doing lots of different types of video, one of the best ring light alternatives above might be the better choice for you.

The exposure and laser power level are typically controlled to optimize the accuracy of the measurements for the signal strength and environmental light level measured. The range data may be internally averaged over multiple exposures prior to transmitting if the sample rate is set appropriately.

The ring light itself is decent, rather than class-leading: color temperature is fixed unless you use filters and there's no way to adjust the brightness. But if you're looking for something small, portable and well priced, this could be the right ring light for your phone.

Ring lights are perfect for vlogging, especially if you're producing beauty content, as they light your face evenly and also give you that telltale ring reflection in your eye. However, they also have downsides: they can be expensive, while they're also relatively inflexible as they're designed primarily for lighting faces. If you want to do more types of content, a ring light alternative might be best for you.

The laser beam is projected from the instrument and is reflected from a target surface to a collection lens. This lens is typically located adjacent to the laser emitter. The lens focuses an image of the spot on a linear array camera (CMOS array). The camera views the measurement range from an angle that varies from 45 to 65 degrees at the center of the measurement range, depending on the particular model. The position of the spot image on the pixels of the camera is then processed to determine the distance to the target. The camera integrates the light falling on it, so longer exposure times allow greater sensitivity to weak reflections. The beam is viewed from one side so that the apparent location of the spot changes with the distance to the target.