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The trip mechanism interrupts the flow of calibration fluid into the glass graduates. Visual observation of this flow interruption in conjunction with a hand-held stop watch can indicate the accuracy of both the tachometer and the shot-counting mechanism. Provided the accuracy of the tachometer is confirmed as above, then the operation of the shot counter can be checked by measuring the time taken before the flow is interrupted dependent on the number of shots selected. The stop watch should be graduated in 0.1 second divisions and, when used at the following speeds and number of shots, should not deviate from the indicated times by more than 0.20 seconds. If the measured times deviate by more than this figure then the mechanism should be checked.