OPTICAL STRESS MEASUREMENT
DSR-type Surface Stress Meter SSM-II
This is an instrument for non-destructive experiment to determine the surface stress of chemically ion-exchanged glass (not recommended for measuring heat strengthened or heat tempered glass).
Index of refraction at: 25 ºC 1.54
Magnification: 15 x
Min. degree scale: 0.01 mm
Input voltage: AC 220 V
Output: DC 3 V”