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Instructions of telescoping gauge
Telescoping gauges are used to measure the inside diameters of
bores. The plungers are retracted and locked with the lock screw.
The gauge is then inserted into the bore. When the lock screw is
loosened, the plungers extend under speing pressure. Lock the lock
screw, then rock the gauge to assure it is at the largest diameter.
If any corrections must be made, loosen the lock screw and repeat.
With the gauge removed from the bore, the plunger distance is
measuremed with an outside micrometer.
