Socket Testers

A socket tester is a small, hand held device that is plugged into a socket to quickly confirm that an AC wall outlet is working and can provide the power that is needed to power the devise that will be plugged into it.


Socket testers are used to ensure that the wiring is the correct way round. It will detect when there is no earth but will not check if the earth is in good condition if it is there.


The lights on the front of the mains outlet tester will light up in different combinations, this will indicate if there is any type of fault.


There are different types of socket testers:

Simple testers can detect a number of different faults but they cannot indicate or measure effective 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 displaying numerical value of earth loop impedance. They also be 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 general have a mains socket tester in their toolbox to check the safety of the socket and prevent shocks and accidents occurring.

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Part Details Brand Stock Current Rating Voltage Number of Pins Display Type Safety Category Power Source Dimensions Weight Height Model Number p Width Length Safety Category Level Safety Category Voltage Plug Type Minimum Operating Temperature Maximum Operating Temperature
Martindale CP201/32 Socket Tester 16/32A 230V ac CAT III 300 V Martindale 30 16/32A 230V ac 3 - CAT III 300 V Mains 65 x 47 x 65mm 195g 65mm - 47mm 65mm CAT III 300V Type G - British 3-pin -10°C +40°C
Martindale CP301/32 Socket Tester 16/32A 110V ac CAT II 150 V Martindale 17 16/32A 110V ac 3 - CAT II 150 V Mains 65 x 47 x 65mm 195g 65mm - 47mm 65mm CAT II 150V Type G - British 3-pin -10°C +40°C
Martindale CP201/32 Socket Tester 16/32A 230V ac Cat III 300 V RS Calibration Martindale 0 16/32A 230V ac 3 - CAT III 300 V Mains 65 x 47 x 65mm 195g 65mm - 47mm 65mm CAT III 300V Type G - British 3-pin -10°C +40°C
Martindale CP301/32 Socket Tester 16/32A 110V ac Cat II 150 V RS Calibration Martindale 0 16/32A 110V ac 3 - CAT II 150 V Mains 65 x 47 x 65mm 195g 65mm - 47mm 65mm CAT II 150V Type G - British 3-pin -10°C +40°C
Martindale EZ165 Socket Tester 13A 230V ac CAT II 300 V Martindale 0 13A 230V ac - - CAT II 300 V Mains 80 x 45 x 65mm 95g 65mm - 45mm 80mm CAT II 300V - -10°C +40°C
Martindale EZ165 Socket Tester 13A 230V ac Cat II 300 V RS Calibration Martindale 0 13A 230V ac - - CAT II 300 V Mains 80 x 45 x 65mm 95g 65mm - 45mm 80mm CAT II 300V - -10°C +40°C
Martindale EZ365 Socket Tester 13A 230V ac CAT II 300 V Martindale 0 13A 230V ac - - CAT II 300 V Mains 80 x 45 x 65mm 95g 65mm - 45mm 80mm CAT II 300V - -10°C +40°C
Martindale EZ365 Socket Tester 13A 230V ac Cat II 300 V RS Calibration Martindale 0 13A 230V ac - - CAT II 300 V Mains 80 x 45 x 65mm 95g 65mm - 45mm 80mm CAT II 300V - -10°C +40°C
Martindale RSCP501 Socket Tester 13A 200 → 250V ac CAT II 300 V, Model CP-501 Martindale 382 13A 200 → 250V ac 3 LED CAT II 300 V Mains 65 x 65 x 47mm - 47mm CP-501 65mm 65mm CAT II 300V Type G - British 3-pin -10°C +40°C
Martindale RSBZ101 Socket Tester 13A 230V ac CAT IV 300 V, Model BZ101 Martindale 220 13A 230V ac 3 LED CAT IV 300 V Mains 65 x 65 x 47mm - 47mm BZ101 65mm 65mm CAT IV 300V Type G - British 3-pin -10°C +40°C
RS PRO Socket Tester 30mA 230V ac, Model RS ST20 RS Pro 202 30mA 230V ac 3 LED - Mains - - - RS ST20 - - - - - - -
Socket & See SOK 32 Socket Tester 13A 230V ac, Model SOK 32 Socket & See 130 13A 230V ac 3 LED - Mains - - - SOK 32 - - - - Type G - British 3-pin 0°C +40°C
RS PRO Socket Tester 11mA 230V ac, Model RS ST10 RS Pro 123 11mA 230V ac 3 LED - Mains - - - RS ST10 - - - - - - -
Martindale RSCP201 Socket Tester 16A 230V ac CAT III 300 V, Model CP-201 Martindale 86 16A 230V ac 3 LED CAT III 300 V Mains 65 x 65 x 47mm 195g - CP-201 - - CAT III 300V BS 4343 - -
Socket & See SOK 36 Socket Tester 13A 230V ac, Model SOK 36 Socket & See 80 13A 230V ac - LED - Mains - - - SOK 36 - - - - Type G - British 3-pin - -
Martindale RSEZ150 Socket Tester 13A 230V ac CAT II 300 V, Model EZ150 Martindale 58 13A 230V ac 3 LED CAT II 300 V Mains 65 x 65 x 50mm 64g 50mm EZ150 65mm 65mm CAT II 300V Type G - British 3-pin -10°C +40°C
Socket & See SOK 40/16 Socket Tester 16A 230V ac, Model SOK 40 Socket & See 32 16A 230V ac 3 LED - Mains - - - SOK 40 - - - - BS 4343 - -
Martindale RSCP301 Socket Tester 30mA 110V ac CAT II 150 V, Model CP-301 Martindale 25 30mA 110V ac 3 LED CAT II 150 V Mains - 180g - CP-301 - - CAT II 150V BS 4343 - -
Martindale MARPC105/32 Socket Tester 32A CAT III 300 V, Model PC105/32 Martindale 20 32A - 5 Front Panel CAT III 300 V Mains 131 x 94 x 54mm 292g 54mm PC105/32 94mm 131mm CAT III 300V - - -
Martindale MARPC104/32 Socket Tester 32A CAT III 300 V, Model PC104/32 Martindale 14 32A - 4 Front Panel CAT III 300 V Mains 131 x 94 x 54mm 292g 54mm PC104/32 94mm 131mm CAT III 300V - - -
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