The SDT0020 socket tester is the ideal instrument for quick and uncomplicated testing of sockets, cable drums, device cables and connection cables in 230 V networks. The integrated LED display provides direct information about the wiring status of the test object after the tester is plugged in. Fatal connection errors are indicated by various LED lighting configurations. The integrated comprehensive LC display also informs the user about the power state of the socket and the Fi/RCD test function enables the testing of residual current circuit breakers (RCDs) with a tripping current of 30 mA at the touch of a button. Display modes https://elecena.pl/product/19738708/sdt0020-socket-tester-with-rcd-test-and-lcd 2021-10-28 https://elecena.pl/product/19738708/sdt0020-socket-tester-with-rcd-test-and-lcd 2025-11-24