Martindale CP501 Check Plug 240V Socket Tester
Over 2 million people use this Martindale CP501 Check Plug 240V Socket Tester to check that sockets are working correctly.
The CP501 Check Plug socket tester is a quick and simple way to check that standard UK 13A 3 pin sockets are correctly wired. Checking is extremely simple – insert the CP501 into the socket and if there’s an issue, one or more of the three LED light indicators will dim.
A total of 28 different fault conditions can be shown by using the Check Plug, with printed graphical reminders on the front of the tester for common faults such as live neutral reverse, no earth, neutral fault and live earth reverse. An instruction card is included as standard with the tester detailing the full list of faults.