ga('set', 'userId', {{USER_ID}}); // Set the user ID using signed-in user_id. Superfine roughness standard   Ra 1.0 µin    Rz 6 µin

Example Calibration Certificate

superfine standard

The size of the patch for the surface measurement is that the distance between the lines on the left is about 4.0mm.   The width of the area on the top of the block is about 3.3mm.

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superfine standard

superfine standard