Martindale EZ165 Socket & Non-Trip Earth Loop Tester

  • Quick & easy mains socket polarity and earth testing
  • Red/Green LEDs show 28 fault conditions
  • Non-trip earth loop impedance test
  • Tough sculpted design for easy removal

EAN: 5036162187841 SKU: MAREZ165 Category: Tag:


In addition to detecting 28 socket wiring fault conditions and checking mains voltage levels, the EZ165 verifies the earth wiring by carrying out a non-trip earth loop test and indicating its value in 6 discrete ranges from less than 1.7Ω to 500Ω.

A low earth resistance is essential for safety disconnection devices to work properly and prevent electrocution when faults occur. In contrast basic socket testers only indicate the presence of an earth and will do so even when resistance values are dangerously high.

Socket polarity and earth wiring faults are identified by a combination of red LEDs. The 3 LEDs correspond to neutral, earth and live connections to aid fast identification of the source of common faults. A look up chart on the tester provides further fault diagnosis.

The EZ165 is an Advanced Socket Tester as defined by the Health & Safety Executive as it indicates earth loop impedance.  Advanced Socket Testers offer a simple solution to verifying socket earthing and are commonly used by engineers and technicians prior to servicing and installing mains powered electrical and gas appliances.

The EZ165 replaces the Martindale EZ150.


Nominal operating voltage 230V AC rms
Operating frequency 50Hz
Power consumption <2.5W
Power from mains socket under test
Non-trip earth loop impedance ranges 0 – 1.7 – 5 – 10 – 100 – 200 – 500Ω
Earth loop threshold accuracy ± (10% + 0.3Ω) *
Voltage low indication <195V ± 5%
Voltage high indication >270V ± 5%
Earth neutral voltage high indication >30V nominal
Open earth indication >500Ω ± 10%
65 x 80 x 59mm
Weight 93 g approx
Temperature (Operating & Storage) -10°C to 40°C, at max. 60% RH
Altitude up to 2000m
Weight 93 g approx
Pollution degree: 2
Weight 93 g approx
Safety Conforms to BS EN 61010-1, CAT II 300V, Class II, double insulation
EMC Conforms to BS EN 61326-1

* Measurement accuracy can be affected by highly inductive or capacitive loads distributed on the supply.


Indicate functional socket
Detect line/neutral reversal
Detect presence of earth
Audible indication
Mains voltage check
Earth loop impedance range
Earth loop impedance value
Polarity swap touch test
30mA RCD trip check
Digital display