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Every home inspector should have one. It could be used for the Standards of Practice at Home Inspection Standards of Practice - InterNACHI®.
According to the InterNACHI® Home Inspection Standards of Practice, a home inspector is required to inspect all ground-fault circuit interrupter receptacles and circuit breakers observed and deemed to be GFCIs using a GFCI tester, where possible.
And here’s a big list of inspection tools Home Inspection Tools & Equipment List - InterNACHI®.
If a GFCI fails to test when using a tester, it is not defective unless it does not trip when the button is pressed, pressing the button is the only way to test a GFCI according to UL.
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Rollie is correct. The only recognized testing method is the built in test button. The training should be changed to reflect this.
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Don’t know if the training addresses that the indications are not always correct or that they can be fooled by a bootleg ground.
It also seems that many are unaware that an ungrounded receptacle will not trip if a 3 light tester is used.