Plain plug gauges manufactured to order (normally 5 / 7 days) to the relevant sizes required are used for checking the size of a machined hole. They are used as an acceptance gauge with a go (pass) nogo (failed oversize) end.
A plain plug gauge does not return a size, but instead returns a state. The state is either acceptable (the part is within tolerance) or it is unacceptable (and would be rejected).
