Fellow techs I'm looking for some kind of high temp heat gauge that'll record the highest temp reached. Customer thinks self clean isn't reaching 850f. I dont want to stand around for an hour or leave my digital MM there and leave. My DMM goes to 1400f but I can't leave there and leave. It wouldn't record the highest temp reached anyway. Any recommendation as to a gauge I can leave in the oven that'll record the highest temp reached???