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Plane glass plates are designed to test the flatness and parallelismof measuring surfaces of the interference method.
Comes with calibration certificate in original plastic case.Diameter - 30 mmHeight - 15,62 15,75 15,87 16,00
Other sets can have different values (nearly these) height.
Measurement range of micrometers - 0-25 mm.Discount for the combined shippingI will add a tracking number in