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A socket tester is a small, handheld device that is plugged into a socket to quickly confirm if an AC wall socket is working. Testers also identify if the socket is producing the power rating expected from a socket. You can find out more in our comprehensive [socket testers guide](/web/content/discovery/ideas-and-advice/socket-testers-guide).

Socket testers are used to ensure that the wiring is the correct and can detect if there is no earth, however, cannot check if the earth is in good condition if it is there.

The simple interface features lights on the front of the tester that will light up in different combinations, this will indicate if there is a fault and show the user exactly what the fault is.

### Different types of socket testers:

**Simple testers** can detect a number of different faults but they cannot indicate or measure the earth fault loop impedance. They are normally the same size as a 13A plug.

**Advanced testers** have the same normal functions that a simple tester has including reversed line and earth, or reversed line and neutral. They display the range of numerical values that the earth fault loop impedance falls.

**Professional testers** have the same normal functions that a simple tester has, including the numerical value of earth loop impedance reading. They also are used to measure the values of earth loop impedance to certify or report on the installation that has been carried out.

### Who would use a socket tester?

Electricians, maintenance personnel, DIY enthusiasts, handymen and equipment installers would generally have a mains socket tester in their toolbox to check the safety of the socket and prevent shocks and accidents from occurring.



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Socket Testers | Plug & Wall Socket Testers | RS

Socket Testers

RS PRO, Model RS ST20 Socket Tester 30mA 230V ac RS Calibration

Martindale Socket Tester 13A 230V ac Cat II 300 V RS Calibration

Martindale, Model BZ701 Socket Tester 230V ac

Martindale, Model BZ701 Socket Tester 230V ac RS Calibration

Stanley, Model FMHT82569-6 Socket Tester 230V ac CAT II 230V

Seeit, Model HT107D-EU Socket Tester 250V ac CAT II 300V

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3 Phase Testers | RS

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Mains Socket Testers | RS

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Martindale Socket Testers | RS

<p>Martindale Socket Testers are electrical testing devices designed to check the wiring and safety of electrical sockets. These testers are used to ensure that sockets are correctly wired and that the earth connection is working correctly. The testers work by being plugged into the socket and then indicating whether the wiring is correct or not through a series of LEDs or a digital display.</p><h2>Why use a Martindale Tester?</h2><ul><li>Safety - Socket testers are designed to check for potential electrical hazards in the wiring of sockets and by using one people are protected from an electrical shock and appliances are not damaged due to faulty wiring</li><li>Simple and easy to use – no training is needed to use one and results are displayed in a clear and easy to understand way</li><li>Time-saving – these testers can quickly identify faults in electrical sockets, so problems can be fixed straight away without the need for expensive equipment or professional help</li></ul><h2>Applications that use Martindale socket testers include:</h2><ul><li>Domestic and commercial electrical installations where electrical sockets are present</li><li>Electrical testing and inspection to identify faults and ensure that electrical systems are safe and up to code</li></ul><h2>Factors to consider before buying a Martindale socket tester include:</h2><ul><li>Type of socket – you need a socket tester that is compatible with the type of sockets you will be testing</li><li>Display type – can feature audio alarms, LEDs or a digital display</li><li>Testing functions – do you need additional testing functions, such as checking for reversed polarity or low voltage</li></ul>

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