All electronic measuring instruments have to be calibrated annually or as recommended by the manufacturer to meet with current guidelines.
In PAT testing all of the manufacturers recommend an annual PAT Tester calibration. In the IEE Code of Practice 3rd edition it is now recommended that PAT testers are checked periodically to ensure that they are still in calibration between the annual calibrations and must be recorded in a register for inspection. This does not replace the requirement for an annual calibration.
The calibration checkbox will also require an annual calibration.
