Dorsey metrology is one of the leading manufacturers of measuring instruments in the world. As the company grew and grew, Dorsey metrology began producing aperture meters in more than a thousand sizes and varieties for use in the United States and around the world.

Dorsey's products are mainly divided into the following categories:

1. Instruction sheet and accessories

2. With meter measuring device, altimeter, caliper and depth gauge

3. Inner diameter and outer diameter measuring instrument

4. Large diameter measuring gauge and digital display caliper

5. Optical comparator

6. Set ring, standard device, etc