DescriptionTHIS IS FOR THE SEAWARD APOLLO RANGE OF PAT TESTERS…..The Seaward Apollo PAT Tester Checkbox is designed to test the accuracy of Seaward Apollo PAT testers such as the 400/400 500/500 and the 600/600 in between annual calibrations. It is capable of checking the testers’ auto test sequences for Class I appliances in addition to Class II appliances. The checkbox shows that the testers are capable of detecting fail results whilst a simple test with the supplied IEC lead will show that they can detect pass results. PART NUMBER: 380A953