| 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: 0.1µm/0.1µm
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