Professional socket tester detecting 31 fault conditions with non-trip earth loop impedance testing and T-Safe technology.
The Martindale EZ150 was the first socket tester to include earth loop impedance measurement, and it remains the benchmark for UK electricians. Its T-Safe technology ensures that RCDs will not trip during the loop impedance check — a common frustration with cheaper testers that cut power to entire circuits during testing.
The Martindale EZ150 is the socket tester that serious electricians carry alongside their multifunction tester. It provides a fast first-look at socket condition without the setup time and calibration of a full loop impedance measurement with a multifunction instrument.
Where basic three-LED socket testers check for correct wiring, reversed polarity, and missing earth, the EZ150 detects 31 different conditions. This extends to high earth impedance, broken neutral, and several complex fault combinations that cheaper testers cannot distinguish. In EICR inspection work, identifying the precise nature of a fault before opening the circuit saves time and narrows the diagnosis before further investigation with a full instrument.
The T-Safe technology is the EZ150’s standout feature for working electricians. When performing the earth loop impedance check, the test current is carefully controlled to remain below the trip threshold of installed RCDs. Standard loop impedance test methods apply enough current to trip 30mA RCDs, cutting power to the entire circuit and requiring a reset visit to every affected outlet. T-Safe avoids this entirely, allowing loop impedance measurement across a full installation without interrupting supply to sockets or appliances. For electricians working in occupied homes, offices, and multi-unit properties, this is a significant practical advantage.
The EZ150 is a supplementary tool, not a substitute for a full EICR with a calibrated multifunction tester. It does not replace a Fluke or Megger instrument for ring circuit continuity, insulation resistance, or full Zs measurement. Its value is speed: plugging the EZ150 into each socket on a visual inspection tour gives an instant fault indicator before committing to a full electrical test.
The Martindale EZ150 is the professional socket tester that goes beyond basic pass/fail. Its 31-fault detection, earth loop impedance measurement, and T-Safe non-trip technology make it an essential pre-screening tool for electricians carrying out inspections, EICR work, and quick socket checks on occupied premises.
| Fault Detection | 31 conditions |
|---|---|
| Earth Loop Impedance | Up to 500Ω |
| Non-Trip Technology | T-Safe |
| Indication | LED traffic light system |
| Voltage Range | 220-250V AC |
| Power | Powered from socket under test |
| Standards | BS 1363 |
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