The Optical Comparator - 2: Sizes and Styles
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
The two most common optical comparator styles are shown in the this image.

On the left is the horizontal style that shines a beam of light horizontal. (see the previous page for an explanation of how it works). This style is, by far, the most common optical comparator found in machine shops.

To the right of it is the vertical style which shines a beam of light vertically through a piece of glass to a mirror on the very bottom which bounces the light back up to the screen. This type of comparator is popular for small parts of even thickness because they can be laid on the glass as gravity holds them in place.
A large comparator with a 30" screen. Note the curtain that can be pulled around the hood to keep out extra light.
12" comparators are fairly common. They are the smallest of the lamp comparators and can be placed on almost any bench.
Various eye loupes and mini comparators are available which have finely scribed lines inside that are similar to a large screen comparator
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