The check plug is a fast and easy way to ensure that 13A sockets are wired correctly, indicated by all three high brightness, long life, LEDs illuminating.
Wiring errors are indicated by one or more LEDs failing to light with the pattern of lit LEDs indicating the type of fault. This failsafe system means that any LED not lit indicated a problem.
The unit has a virtually indestructible, flame retardant ABS case with a sculpted shape for easy removal. The plug induces less than 5mA of earth leakage, well below RCD trip thesholds.
As with all simple socket testers, the plug only verifies the presence of an earth, it does not assess its quality.
