The Martindale CP201 250V Industrial Check Plug is designed for use in industrial applications and comes with a built-in 250V 16A plug attached into a standard Martindale Check Plug socket tester.
When plugged in, the CP201 allows you to check that the socket you're evaluating is wired correctly, with three flashing LEDs that indicate potential problems within the wiring. Depending on the fault the LEDS will flash a different colour, with each colour scheme shown on the tester for easy reference.