I actually tested mine in boiling water before I installed it. I was surprised to see that it was pretty spot on. I still wouldn't really want to trust it though. But then again so far all I've really used my Akorn for is grilling. My WSM and Cajun Bandit get called upon for low & slow.
Lang 36 patio
18.5" Weber Smokey Mountain
22.5" Weber OTG with Cajun Bandit Conversion Kit
Char-Griller Akorn with side cart
1999 Weber Master-Touch - bent but not broken
14.5" Weber Smokey Joe Silver