Starr Instruments TGD-100 - 3.3 Setting probe frequency; 3.4 Measurement of thickness; 3.5 Zero calibration

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3.3 Setting probe frequency
Press  key to move the cursor to the position as that shown in the
following figure. Press  to change the frequency setting. LCD will display in
sequence the probe frequency to be set 5M, 7M or ZW.