Kewtech Digital multi function tester CONTINUITY INSULATION LOOP PSC RCD Features :- Continuity, Insulation, Loop/PSC, RCD tests in a single unit 20/200/2000 Ohm (auto ranging) 250/500/1000V insulation tests 20/200/2000 Ohm Loop range PSC measurement to 20k A.16 RCD test current ranges & DC test Auto discharge Designed to BS EN 61010-1/IEC 1010-1 Category III Complies with BS 7671 17th edition wiring regulations Fully protected against accidental phase to phase connection.