I've always said a cup of tap water for 1 minute at high should be at least 120°F otherwise just wait for the sink supply in most homes.
I also carry microwave popcorn and will pop a bag for function and snacking on vacant properties and will ask permission on occupied, when clients are around, they like the treat and proof their future micro is working.
The issue on this one instance is a $900.00 unit that requires repair or replacement IMO and the warranty co. does not want to honor their agreement, go figure.
I was just curious what test methods were used by others.
Warranty co. says, "Inspector's 1 minute test along with a light tester is inferior and should be tested on high for 2 1/2 minutes this should boil water 212°F in most units."
Unit in question will only get to 200°F by their own time and test,
"but that is close enough" they say.
Glad I don't have to eat their cooking
Found this wattage formula but doubt it's any better than what I/we try to do during an inspection
How to Easily Test Your Microwave Oven's Wattage
I'm with Jim on the boiling thing, injury or too messy on previous occasions
I'll be sticking to the 1 minute and light tester or popcorn until shown different
HNY BTW and thanks for your replies