Well, you're making an assumption that the thermometer is reading ambient temperatures, & you are probably right, but it IS possible to read surface temperatures
with a thermometer...some of us that have been around a whilehave done so for years, by laying a thermometer right over the UTH & then waiting a while for the
accurate reading. I honestly do NOT like temp. guns...I bought a decent one & used it for a while, but it gave flaky readings that had to be taken multiple times...so
which one is the REAL one, if you know what I mean? Anyway, I sold my temp. gun & don't miss it one bit...I have a box of mercury thermometers that work just fine.
Note, I'm not trying to change anyone's methods here, just giving a caution about jumping to the wrong conclusions. You ARE correct that UTH must be regulated...![]()