Flat glass is used to check for interference methods of measuring the flatness of plane surfaces of end measures of length gauges, measuring instruments and tools.
Comes in original plastic case.
Diameter - 100 mm Height - 25 mm Flatness - 0,07 µm Local 0,02 µm

Delivery times depend on courier services, and not on me.
 "Please do not shoot the pianist. He is doing his best."
Oscar Wilde .