Have a similar one. Used it to test the receptacles in a friends office. All OK until the last one. Hot neutral. Their electrical contractor got there very fast and rewired it.
I've never tested a GCFI outlet because all mine have a test button on them, but these are invaluable for checking that ground and neutral are not crossed/joined (and that there is power at the outlet). I suppose if you have a GCFI breaker these could be useful.
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Thank you!