Bearing is a high-precision mechanical parts, in order to ensure the measurement accuracy, so all kinds of bearing special measuring instruments are also equipped with their own high-precision measurement parameters and performance (such as bearing vibration measuring instrument frequency response and amplitude linearity, etc.), in order to ensure that the parameters and performance of these instruments can continue to maintain its accuracy and stability, must be calibrated on a regular basis on the parameters and indicators of the instrument.

Calibration of specialised instruments is usually carried out in a measuring room with certain environmental conditions (e.g. constant temperature and humidity), and requires a special high-precision calibration device to ensure the accuracy of its traceability, and the calibration personnel should have the appropriate qualifications and experience.

Instrument calibration items are: bearing vibrometer, residual magnetometer, bearing special comparator (such as diameter, height, etc.), general three major gauges.