I have used this thermometer gun for general temperature testing but more specifically for testing the temperature of must (wine) fermentation in 45 gallon drums. It agreed closely with a floating thermometer that I had been using. However, I dropped it from my pocket and, unfortunately, it no longer works. It seems to be a very fragile instrument and I would recommend being very careful while using it. Not sure if I will order another one. UPDATE: After messing with it for a while it now works!!!