Spherometer

 To calibrate (zero) the Spherometer, you place the 3-legs (or rim of the cone in the cone type) onto the flatness reference. Insert the depth probe of the calipers through the center hole of the fixture, as if to measure the depth from the top of the fixture to the reference surface, and push the "zero" button to set the digital calipers to read zero at that depth. You can also zero to a lens of known precision curvature, and add the corresponding depth to subsequent measurements.

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