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Socket testers have become an essential part of any professional electricians' toolkit.
Generally extremely cost effective and cheap, socket testers are also incredibly simple to use, and require the user to simply insert the tester into a socket quickly and the tester will evaluate the internal wiring of a socket without the need to remove the socket faceplate and potential cause damage to the installation.
Depending upon the type of socket tester used the way information is communicated will be different; some socket testing devices uses LED indicator to show wiring status, while other use audible indication to show correct wiring/problems with the installation. Some also use a combination of audible and visual indicators, allowing users to quickly tell if there's a problem with a socket or not.
Shop4 Electrical supply a range of socket testers from Kewtech, Dilog and Megger with more advanced models testing earth loop impedance and voltage.