[5530] Aicevoos AS-D9B socket tester

Description

When plugged in and switched on, shows voltage, missing earth and leakage, as well as incorrect wiring (the polarity of line and neutral doesn’t matter, though).
More convenient than multimeter-type circuit tester, especially when socket holes have safety covers.
Voltage reading accuracy can vary a couple of volts.
Please don’t press and hold the RCD button accidentally, as it can trip the fuse, causing a blackout!