Calibration Record Clifton Factory Calibration record must be ordered with equipment. Factory calibration record. The completed calibration record will be enclosed at the rear of the instruction book accompanying the Clifton unit carrying the following information:Unique record number for trace ability, serial number of the unit, instrument it was checked against, calibration temperature and actual sensitivity results. The measurement of uncertainty ±0.8°C. Ambient temperature 21°C ±3°C.