Pocket comparator
A pocket comparator is an optical device for measuring and inspection comprising a loupe and a reticle. The instrument was developed and manufactured by the Bell & Howell Company, but similar instruments of other names are made by other manufacturers.
It is used for:
- Linear measurements in fractions of an inch
- Circular measurements in fractions of an inch
- Radius measurements
- Angle measurements
- Narrow line width measurements
- Circular measurements in decimals of an inch
- Linear measurements in inches
- Linear measurements in millimeters
Measurements are performed by bringing the surface of the reticle as close as possible to the work inspected.