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The Starrett 643JZ dial depth gage has the following specifications:
Dial Reading: 0-25-0
Includes a case
This gage has a knife-edge base and a needle point contact which has
been hardened and ground. The knife-edge base has a cutout so that
the conical point can be precisely positioned for close work. Point is
1/2" (12.7mm) long with a 60º included angle. In action, the inspector gently pushes the point down to read zero with
the base and then pushes down to make the needle point contact the
work piece to take the measurement.