That'll be the exception that proves the rule then!
I've not seen a battery tester that can manage that until you get into the realms of microohmeters/ducters etc
Yes, multimeters are battery but the test current they produce is in the order of milliamps.
An earth test is carried out at either 100 to 200 milliamps or 10 to 25 Amps.
The latter being the usual test current for heaters, kettles etc.
A battery in a multimeter would not have the power to produce thsr sort of current.
Hope this helps.
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