It's hardly pointless or useless pointing out that your advice would result in a non-compliance with BS7671. Anyway you are unquestionably the most ridiculous "contributor" to this forum.
The 3rd Amendment changed it from supervision of a skilled/instructed person to a documented risk assessment - it retained the prohibition for domestic premises however (433.3.3 (a)).
Labelled socket-outlets, on the other hand - which you did not mention in your earlier post - are intended for server rooms etc. and not for some random socket-outlet in a house.
The point is to show that your tester(s) are still working correctly. I suspect the answer to your last question is "yes". If dirt/corrosion/stress causes a connection to exhibit impedance which it should not, then the equipment could easily appear to be working correctly yet be providing defective results. Ditto if any component goes out of spec - these testers all have a lot of analogue components in them, and they are not go/no-go in the way that they work.
The 3rd Amendment changed it from supervision of a skilled/instructed person to a documented risk assessment - it retained the prohibition for domestic premises however (433.3.3 (a)).
Labelled socket-outlets, on the other hand - which you did not mention in your earlier post - are intended for server rooms etc. and not for some random socket-outlet in a house.
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