These gages directly measure the diameter of chamfered holes. No setting master is necessary. When the three-blade plunger is pressed against a flat surface, the gage should read the set number stamped on the back of the indicator. In case of wear, the gage may be adjusted to read the proper number.
All ground surfaces are of hardened tool steel. Indicators are AGD design.
Internal gages will measure the largest diameter of any chamfer that has an included angle within the range of angles printed on the dial face of the gage.
External gages will measure the smallest diameter of any chamfer within the range of angles printed on the dial face of the gage.
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