TIS Socket Tester With Buzzer Designed to test 230V 13A sockets to international standards 1010-1 CAT III 600V in one easy step. Simply plug in for a visual and audible indication. Reliable and easy to use. Wiring conditions that are included: correct, missing earth, live earth reversal, live neutral reversal, missing neutral*. simple and easy to use with no maintenance or batteries.*this unit will not indicate neutral/earth reversal
