It is a device used to measure the strain of the lens, and find damage of the sunglasses if by screwing too tight during the produce process.
■ Device for measuring the changes in distances between points in solid bodies that occur when the body is deformed.
■ 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.
■ Suitable for all transparent lens and colored lens.
|Electric Voltage:||220V/50Hz or 110V/60Hz|