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The number of lines on the top of the horizontal zero line tells you the millimeters. We can see 4 lines for this measurement. Meaning our measurement is over 4 mm.

This graduation shows you the tenths and hundreds of a millimeter. It is divided into 50 graduations. There fore each graduation equals 0.01 mm. We will simply have a look at which graduation lines up with the horizontal zero line. For this part, we can see that the number is 29. Because we can not see the half-millimeter line we just add this number to 4.0 mm. Therefore our final dimension is 4.29 mm.

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Lines under the horizontal zero line show us the half-millimeters. When you can not see the half-millimeter line it means that your dimension is between 4.0 and 4.5 mm. If we can see the half mm line, it means that the dimension is between 4.5 and 5 mm.

5.4: How to Measure With Micrometer is shared under a CC BY-NC-SA license and was authored, remixed, and/or curated by LibreTexts.

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A micrometer is an essential tool for taking precise measurements. It has a precision of 0.01 mm and if you ever aspire to make something with tight tolerance you will probably need to use it. We will have a look at how to use a traditional analog micrometer and how to read the dimension correctly.

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Reading the micrometer can be tricky when you are not used to it. To mitigate any reading error, it is helpful to take a rougher measurement with calipers first to see what dimension you are aiming for.

Video: In this video, we are looking at a micrometer. This is a device for taking precise measurements. It has a precision of 0,01 mm and is essential in any machine shop. I am quickly showing how it is built and how it works as well as how to take a measurement with it. I hope this is helpful.

In the video, I am showing how to take the measurement and also talking a little bit about how the micrometer is made. So this could be helpful for understanding this device a little better.

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