The Frequency Spec Shaft is used to confirm the clamping pressure required to read correct frequencies on the DIGIFLEX™ Frequency Meter. Clamp the shaft firmly, oscillate it and read CPM’s displayed in meter’s digital readout. Adjust clamping pressure and repeat the oscillation steps until CPM’s match the exact spec frequency. This trains you and your employees on how to repeat correct clamping pressure to ensure 100% accurate frequency readings. Frequency Spec Shaft can also be used to compare accuracy of other frequency meters.