Test for 180-250VAC circuit
Detect faulty wiring status in 3 wire receptacle.
Checks the earth loop impedance of the wiring under test, and indicates the range that the measured earth loop impedance falls within.
This socket tester will give indications as well if the main voltage is below 210V or above 250V.
It could perform self test after plug-in.
30mA leakage current measurement.