To comply with the stated requirement for the routine checking of a PAT Testers accuracy, the Seaward Compliance Upgrade Kit is designed to be used with your existing PAT Tester. It includes a Seaward PAT CheckBox, which provides a safe, simple and quick means of checking your PAT Tester. Also included is the Seaward RC 750 RCD Tester, a handheld digital unit that helps you comply with the requirement for RCD trip time test on adaptors and extension leads. It is compliance made easy!