[jimmaswell]

15A and 20A receptacles on the same circuit sounds fine as long as it's a 20A circuit? And how could it tell which outlet is on which circuit?

[MagicMoonlight]

It can’t, but it’s read reports before so it sure can simulate an answer.

[OJFord]

To give it the benefit of doubt, it's possible it saw a circuit labelled "kitchen" in the panel, and then in photos of the kitchen saw mixed outlets.

(I'm not in the US - would a 'home inspector' actually go around buzzing out outlets anyway?)

[dgemm]

They won't necessarily map out all the circuits but they will generally test them all with a tester to find wiring problems.

[wil421]

Yes, most will at least test GFCI receptacles especially in the kitchen. I bought one to test my basement after a renovation.