MART Plug-In Socket Tester
£5.40
https://www.electricals247.co.uk/ Go to shop Description
MART Plug-In Socket Tester\n- Mini portable design, easy to carry, and simple to use.- RCD (or GFCI) test.- Voltage test(with LCD).- Can detect the wiring status of the socket quickly and accurately.- Widely used in the school, laboratory, factory, and other social fields.