Martindale, Model EZ150 Mains Socket Tester 13A 230V ac CAT II 300 V

The only safe solution for socket testing, as it varifies that the earth is connected and indicates the quality of the earth connection. The T-Safe™ technology gives earth loop impedance checking without tripping 30mA rated RCDs
13A mains socket tester
3 red/green LEDs indicate 6 loop impedance ranges (±10%): 0 - 1.7Ω, 1.7 - 5Ω; 5 - 10Ω; 10 - 100Ω; 100 - 200Ω; 200 - 500Ω
3 red/green LEDs indicates wiring good plus wiring fault conditions: P-N reverse, P-E reverse, P fault, N open, E open
Also indicates undervoltage (<195V) and overvoltage (>270V) conditions
Overvoltage Category: CAT II, 300 V

High sensitivity RCDs or excessive earth leakage currents may cause inadvertent tripping of the circuit. Always check prior to use where loss of supply may be hazardous or unacceptable.
This unit is an indicator only and is not designed to provide readings for completing certificates

This product is not suitable for testing sockets that are supplied via an isolating transformer.