Pocket Comparators are small, portable devices used in manufacturing and quality control to inspect and measure parts and components with high accuracy and precision. These compact instruments are designed to fit in a pocket or a small carrying case, making them ideal for on-site inspections or field work.

Pocket Comparators typically use a high-intensity light source and a series of lenses and mirrors to project an enlarged image of the part onto a screen. The operator can then use a measuring scale or a digital readout system to take accurate measurements of the part's features. Some pocket comparators may also include additional features such as a built-in magnifying glass or a digital camera for capturing images of the part being inspected.