There are several plug in sockets to enable you to test sockets with your meter probes without taking the socket off the wall - Socket & See do a range.
Have also seen on HSE website examples of plug in socket testers that give EFLI readings as a range - never seen them in the flesh. Surely if anyone is interested enough to test for EFLI they would want an actual and accurate figure off a proper calibrated 16th edition tester rather than in a range given by a LED indicator in a Martindale style socket tester.
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