The MSR Rotator is calibrated prior to shipment from our production facility.  The calibration of an MSR Rotator involves calibration of the voltage input and output to the 1 mV/RPM.  This is accomplished by rotating a shaft at a set RPM, measuring the rotation rate with an external tachometer, and then adjusting the potentiometers passing voltage between the user control and the motor.  Finally, the system is calibrated with a traceable voltage source.  At the customer site, calibration may be required.  The MSR Rotation Rate Calibration Kit provides the tools to perform the front aspect of the instrument calibration.