For factory and industrial maintenance, the 250V Industrial Check Plug (CP201) is fitted with a standard blue 250V 16A BS4343/ IEC309 plug (round 3 pin). Simply plug it into an appropriate socket outlet and it will instantly identify whether or not the socket is correctly wired, in the same way as the Classic Check Plug.
A revolutionary new socket tester with earth safety test, voltage and wiring checks. Conventional socket testers have the weakness that they only tell you if the earth is connected, they dont tell you how safe it is. Martindales new T-Safe Technology gives safe earth loop impedance checking within carefully selected bands without tripping the RCDs.