SHIMPO CAG-2000 1 Channel - Manual (Page 35)

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(3) Set the minimum master in the measuring head. When the indication is about the
minimum master value, the adjustment is finished.
When the indication is not about the minimum master value, turn the zero adjustment
knob to bring the indication to the minimum master value. Set the maximum master
in the measuring head. If the indication does not come to about the maximum
master value, repeat steps (1) and (2) in 10.2 or 10.3.