Mains Polarity Tester Plug

MSRP   £10.99
WAS £9.95 £8.96
WAS £9.95 £8.96

Simply plug the Mains Socket Tester into a 13amp socket and the Mains Tester will check the following: neutral connections, earth connections, reversal of live/earth connections, non-connection of either live or neutral.

Home Delivery
Click and Collect

The W4 Mains Socket Tester is an easy-to-use diagnostic tool for checking any UK 13-pin mains socket outlet.  When plugged in and the socket switched on, it will indicate if the socket is functioning correctly, if there is no earth connection, if the socket is incorrectly wired, or if the live and neutral polarity is reversed.

The Socket Tester is particularly useful when touring in your caravan or motorhome in Europe, where it is not uncommon to find campsite hookups with a reversed polarity.  The W4 Socket Tester will quickly indicate if this is the case, allowing you to swap the polarity in your mains connection lead if necessary.  Some regular caravanners carry a spare short lead with a reversed polarity along with this tester, to allow the polarity to be corrected as it enters the caravan without needing to use any tools on arrival.

  • Specification: 240volt AC.
  • For use in 13amp outlets to BS1363.
More Information
EAN 5019328200189

Zone A

Standard Delivery £4.95* (FREE on orders £100+)*

Allow 3-5 working days for delivery.

Expedited Delivery options from £6.95*

Options for 1-2 working day delivery and next day timed services available on most items

Zone B

Surcharge Areas

Scottish Highlands / Offshore Islands within post code list below:
AB31 to 38, AB40 to 56, HS, IV1 to IV28, IV30 to 32, IV36 to 49, IV51, IV55 & 56, IV63, KA27 & KA28, KW1 to 17, PA20 to 38, PA41 to 49, PA60 to 78, PH4 to 44, PH49 to 50 & ZE

Standard Delivery from £14.95* (£4.95 REDUCTION on orders £100+)

Full rates are available on our delivery, terms and conditions page.


Some heavy or bulky items are charged differently, for example

  • KAYAKS - Bulky Item Courier Service (7-10 Day Delivery - varied rates apply to these items)

Some other items are held at a remote warehouse any may be available on STANDARD delivery only. In these cases, expedited delivery options are not available to choose at checkout. Also for these items, click & collect reservations may take up to a week to come into store - where this is the case you will be contacted by the store as soon as possible.



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