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Ermenrich Zing ST30 Socket Tester
https://eu.ermenrich.com/catalogue/electrical-measuring-tools/socket-testers/ermenrich-zing-st30-socket-tester-yellow/
The Ermenrich Zing ST30 Socket Tester is designed to test whether all of the sockets are properly wired and to check the voltage. The tester must be plugged directly into a socket, and the LED’s flashing will indicate various electrical faults: no ground/no neutral, live/neutral reverse, or live/ground reverse. In addition, the specific color code that appears on the tester screen signals the corr
