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The Martindale CP501 check plug socket tester provides a quick and easy way to ensure that 13A sockets are correctly wired, indicated by three bright long life LEDs. Wiring faults are indicated by one or more of the LEDs failing to illuminate, with the pattern of lit LEDs indicating the type of fault detected. This fail-safe system means that any LED not lit indicates a fault. The robust ABS housing has a sculpted shape for easy removal and there is a look up chart on the tester for quick fault diagnosis.


  • Quick & easy testing of socket wiring
  • Detects 28 fault conditions
  • Three bright LEDs with clear & simple fault codes on the plug
  • Tough sculpted design for easy removal


  • Operating voltage: 230V
  • Operating frequency: 30 Hz to 70 Hz
  • Power consumption: < 2W
  • Power: From mains
  • Open earth if earth resistance: > 50 kΩ nom at 230V AC nom
  • Open neutral if neutral resistance: > 50 kΩ nom at 230V AC nom
  • Earth Leakage: < 5 mA on a correctly wired socket
  • Dimensions: 65 mm x 80 mm x 59 mm
  • Temperature (operating & storage): -10 °C to 40 °C, at max. 60% RH
  • Standards: BS EN 61010-1, CAT II 300V

Stock Code: TESTSKT1

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