The Wiha Tools socket tester of 230 V AC allows easy testing of Schuko sockets for correct wiring. Errors are clearly indicated by an LED display and allocated to the error source. It can also be used in cramped work situations and allows easy reading of the measurement results at all times. In line with the measurement category CAT II up to 300 V, the socket tester from Wiha offers maximum security when working on electrical circuits.