It is a device used to measure the strain of the lens.
Detailed Product Description:
1. Device for measuring the changes in distances between points in solid
bodies that occur when the body is deformed.
2. It is used either to obtain information from which stresses (internal
forces) in bodies can be calculated or to act as indicating elements on
devices for measuring such quantities as force, pressure, and acceleration.
3. Suitable for all transparent lens and colored lens.
Electric Voltage: 220V/50Hz or 110V/60Hz