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As PAT testers are sophisticated instruments, it is important to make sure that they are continuing to measure correctly. If a company fails to check and maintain calibration, it could face difficulty substantiating any measurements in the event of a claim. It is usually recommended that calibration is carried out annually on a PAT testing unit.
When a PAT tester is calibrated, it is
*Ensuring the resistance readout is accurate and correcting for any drift arising from ageing of components inside the PAT tester,
*Calibrating the unit back to national standards. This is best performed by the product manufacturer (if they offer a calibration service) or a laboratory accredited by [[United Kingdom Accreditation Service]] (UKAS)<ref>[http://www.ukas.com/ The United Kingdom Accreditation Service]</ref>
*If it is mains powered, then a safety test must be carried out.
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