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Megger MST220 Audible Socket Tester

SKU: MST 220

The Megger MST220 is a socket tester that provides both visual and audible alarms that indicate possible wiring errors of UK BS1363 13A 3pin power sockets. Three green LED lights with a continuous tone indicates correct wiring. A combination of green, red and amber LEDs and a warble tone indicates to the user there may be a wiring fault present. The MST220 can identify over 17 combinations of wiring faults including missing wires and incorrect or reversed connections. Users are able to use the MST220 to identify socket faults. Any miswiring or missing connections from sockets can be identified early, ensuring full BS7671 standards are met. The MST220 can also be used during installation and commissioning of electrical connected to 13A sockets if a wiring fault is suspected.

Available in delivery or click&collect

EX. VAT: £27.99


  • Tri-Coloured LEDs for instant error reporting and fault diagnosis
  • Audible alarm of correct sand incorrect connections
  • Identify 17 missing wire and wrong connection combinations

Frequently asked questions

Test equipment is used to diagnose, measure, and evaluate electrical circuits and systems. It ensures systems operate correctly and safely, helps identify faults, and verifies compliance with standards.

Common types include:

  • Multimeters: Measure voltage, current, and resistance.
  • Insulation testers: Test the insulation resistance of electrical installations.
  • PAT testers (Portable Appliance Testers): Check the safety of electrical appliances.
  • Clamp meters: Measure current without disconnecting the circuit.
  • Voltage testers: Detect the presence of voltage in a circuit.
  • Oscilloscopes: Display and analyze the waveform of electrical signals.

Read the manual: Follow the manufacturer’s instructions and guidelines.

Check for damage: Inspect the equipment and leads for any signs of damage before use.

Use appropriate settings: Ensure the equipment is set to the correct range and function.

Wear protective gear: Use appropriate personal protective equipment (PPE) such as gloves and safety glasses.

Avoid live circuits: Whenever possible, test circuits should be de-energized before testing.

Test equipment should be calibrated regularly to ensure accuracy. The frequency of calibration depends on the manufacturer’s recommendations, the equipment’s usage, and industry standards. Typically, annual calibration is common.

The use of test equipment in the UK is governed by several regulations, including:

  • Electricity at Work Regulations 1989: Requires electrical systems to be maintained to prevent danger.
  • BS EN 61010: Safety requirements for electrical test and measurement equipment.
  • Health and Safety at Work Act 1974: General duty to ensure the safety of employees and the public.

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