Transfer Instruments - 7: Surface Gage
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A surface gage is almost always used in conjunction with a surface plate. Although it has many uses the way it is used as a transfer instrument is shown below.

The gage adjusts by tilting the spindle fore and aft using the tilt screw. There is a tool holding clamp to hold the indicator (which is used in the example below)

Once the gage is set the spindle clamp locks everything in place and only the indicator stem will be able to move

In the example shown on the right the tilt screw was used to set the indicator reading to zero on a gage block (not shown) of 0.375 inch thickness. The gage block is then removed and the black part shown is pushed forward so that the indicator stem rides up over it. If the indicator reads zero then the part thickness is exactly 0.375.. If the indicator reads -0.002 then the part is 0.373 thick. If the indicator reads +.002 then the part is 0.377 thick.
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label: transfer instruments, inside, outside, spring. calipers, dividers, hermorphidite, telescoping gage, small hole gage, surface gage