Optical comparators are instruments that produce larger images or profiles of manufactured parts or components. An object gets placed on a glass screen so that the optical comparator magnifies into a two-dimensional image using lenses and mirrors. Optical comparators work well for workshop or other product-testing applications when you want to inspect, measure or evaluate parts to ensure that they meet quality standards.

Inverted and erect optical comparators are the most common instrument models. Inverted optical comparators produce upside-down and left-to-right images. Working with inverted-model optical comparators may require some practice before you start testing. The more advanced erect optical comparator renders images of products and parts in their natural state or orientation for accurate measurements. Not only can you use optical comparators for measuring product dimensions, but they can also be used to detect scratches, dents or other defects that require correction. Optical comparator sizes range from small, portable devices to large, industrial-sized instruments. When searching for an inventory of optical comparators and similar instruments or accessories:

1. Buy optical comparators that meet the requirements for measurement and inspection applications.

2. Pick optical comparator suppliers that offer variety.

3. Know where to go for optical comparator repairs, calibration or maintenance service.

Action Steps
The best contacts and resources to help you get it done

Shop for optical comparators that provide optimum capabilities

Optical comparators must be customized for measurement, inspection and other testing procedures.

I recommend: S-T Industries manufactures horizontal and vertical models of optical comparators. Features include electronic tools, calipers and video inspection systems. Ganesh Machinery distributes optical comparators suitable for inspections and workshop duties. Optical comparators from Nikon Instruments produce high-resolution, magnified images for parts inspection and testing.

Select different types of optical comparators according to measuring and testing needs

Look for optical comparators in different models, sizes and brands.

I recommend: Precision Calibration Services features optical comparators that function with different magnifications and speeds. Optical comparators with digital components and computation features are also available. Micro Quality advertises optical comparators with vision systems, height gages and hardness testers. George S. Maier distributes optical comparators with features, including rotating chart clips, vertical screens and electronic screen protractors.

Gather resources of optical comparator service companies

In case of instrument malfunction, locate companies or optical comparator suppliers that also provide repair and maintenance support.

I recommend: Inspec offers repair and machine calibration services for optical comparators. American Calibration calibrates and repairs measuring instruments such as optical comparators.

Tips & Tactics

Helpful advice for making the most of this Guide

• •  Optical comparators test tools and other equipment used for machinery and in the automotive, aircraft and electronics industries.
• •  Typical size ranges of optical comparators are 14, 16, 24 and 30 inches. The average screen sizes of optical comparators range from 10 inches to 40 inches in diameter.