UEi Test Instruments AK900SC - Manual (Page 22)

22
Calibration
The unit is calibrated to stated accuracy during manufacturing. The
absolute accuracy of the calibration is traceable to the U.S. National
Institute of Standards and Technology (NIST).
The measurements will perform within the specified accuracy over its
life. No calibration is necessary. If the unit gives erroneous
readings, please return to the manufacturer for service.