An optical comparator (often called just a comparator in context) or profile projector is a device that applies the principles of optics to the inspection of manufactured parts.

Optical comparators and profile projectors are used to measure angles, radii, slots, circles and edges on two-dimensional parts. The comparator or projector uses a beam of light to project …

Manufactured without compromise, Starrett optical comparators provide time tested, cost effective solutions for non-contact measurement. At the heart of these systems are precision optics, …

Optical comparators are also commonly known as profile projectors, shadowgraphs, or comparator measuring tools. A typical optical comparator illuminates from below and projects …

Benchtop and floor model optical comparators from OGP offer the industry’s best value and performance for non-contact measurement.

24P Optical Comparator The 24P is designed to be an all purpose measurement/inspection instrument capable of performing both light and heavy duty tasks.

By projecting a magnified shadow or image of your part onto a screen, these optical comparators give you an easy way to measure and inspect its precise features.

Oct 21, 2020 · Optical comparators, also called comparators or profile projectors, are measurement tools used in the manufacturing industry. Comparators inspect, measure, and …

Optical comparators take precise 2D measurements of a part or workpiece. The magnified image of a part projects onto a screen with an X- and Y-axis. These optical comparators offer a non …

Dec 13, 2025 · Learn how to use an optical comparator for precise part inspection. Our detailed guide covers setup, basic measurements, and how to check complex angles.