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| A disk made of crystal or glass with
one surface finished to extremely precise flatness. |
Contact
with the workpiece surface that has been precisely
mirror finished causes interference fringes for light
waves that are observed and the degree of flatness
of the mirror-finished surface can be determined.
It is ideal for inspecting the flatness of the measuring
surfaces of block gauges, micrometers and snatch gauges.
Specifications
Diameter: 60mm (made of glass)/130mm (made of glass)
Thickness: 15mm/27mm
Flatness: 0.1um 0.1um
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