Plane glass plates are designed to test the flatness and parallelism
of measuring surfaces of the interference method.
Comes with calibration certificate in original plastic case.
Diameter - 40 mm
Height - 65,62 65,75 65,87 66,00
Other sets can have different values (nearly these) height.
Measurement range of micrometers - 50-75 mm.
Discount for the combined shipping
I will add a tracking number in EBAY