The microscope body tube separates the objective and the eyepiece and assures continuous alignment of the optics. It is a standardized length, anthropometrically related to the distance between the height of a bench or tabletop (on which the microscope stands) and the position of the seated observer’s…

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Contrast ratio refers to the difference between the minimum brightness and maximum brightness of a monitor. For example, looking at a monitor with a 1,000:1 contrast ratio, a white image would appear 1,000 times brighter than a black image on a particular monitor. A higher contrast ratio, in theory, should produce deeper blacks with increased grayscale detail. In addition, a higher contrast ratio means that scenes that are supposed to be black or dark are more lifelike and don't appear washed out (i.e., shadows look more gray than black).

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LG unleashes $999 OLED gaming monitor with lightning 480 Hz refresh rate — LG UltraGear 27GX790A-B features a 27-inch 1440p panel

OLED (organic light-emitting diode) displays are promoted as having an infinite contrast ratio because the self-lit pixels can turn completely off to present a perfect black. IPS (in-plane switch) displays usually hover around the 1,000:1 mark or slightly higher, while VA (vertical alignment) displays can range from 3,000:1 to 4,000:1 at the high-end.