The faults are instantly indicated by one or more of the LEDs failing to illuminate, with the pattern of lit LEDs indicating the type of fault detected. The testers will convey the presence and nature of a fault using an audible buzzer and an LED display. As with all socket testers the CP501 only verifies the presence of an earth, it does not assess its quality.

The Martindale CP501 Classic Check Plug 240V Socket Tester is the most popular socket tester available. This extremely handy portable appliance testing accessory is ideal for verifying the presence of an earth and can speed up the process of PAT testing multiple extension lead sockets. Where calibration of an instrument is possible we will offer this as a separately purchasable item and may be selected from the drop-down box above.Martindale’s T-SafeTM patented technology gives safe earth loop impedance checking within carefully selected bands, without tripping RCDs and RCBOs. The Martindale PC10532 is designed to test the wiring of industrial sockets for both live and neutral connections. Martindale Electric has always been a pioneer of test equipment, their firsts include; The socket tester, safety insulation tester, non-contact voltage indicator, fuse finder, the first non-trip, no battery, no push button loop tester, the first hand held insulation tester with polarisation index, the first advanced socket tester and the smallest and lightest hand-held PAT testers the HPAT500 plus and HPAT600 plus models. The Martindale PC10532 is a 3-phase industrial socket tester designed for use with 32A 5-pin sockets.

Martindale are one of the UK market leaders in safe isolation testing with their range of voltage indicators and proving units such as the VI13800 and PD440. With over 2 million of these socket testers sold, the Martindale CP501 is the most popular socket tester available. Where applicable we will include the following statement relating to the item/s on the products page under the heading *Important Calibration Information. Founded in 1928 and also owns Edgcumbe Instruments Metrohm® products, as well as the John Drummond Engineers range of test lamps.The Martindale CP501 Check Plug is a popular socket tester that quickly ensures the correct wiring of plug sockets and gives indication of this via three bright LEDs. Not only does the Martindale MARCP520 identify 28 different fault conditions via the super bright LEDs and key system in the instructions, but it also has the added benefit of a 4mm earth connection for a banana plug to guarantee good earth. A low earth resistance is essential for safety disconnection devices to work properly and prevent electrocution when faults occur.