Calibrating the Manson/Brownell should be done in a level plane and the 2 points that establish that plane are the anvil ( the measuring point inside the barrel) and the point where the tool is held during use. After the measurements have been taken I check the calibration again to verify that the measurements I have taken are accurate. While i take the wall thickness measurements I repeat the measurement in each position to verify accuracy. Edgar, the pictures of your work area remind me of home on intense days.
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