Hey ReefMack! I was thinking of you every moment when I was emailing this Mark guy and how they treated you. I gave him a pretty hard time back and forth, but in a smug way. He never banned me, I couldn't believe it knowing RC and their BS. I basically ended with because of this email I will never sponsor on your site, which I was somewhat considering in the near future. But now, no way. I didn't really spend much time there but figured it may bring in a sale or two.
Enough of that, I do have some pretty good emails from this guy, I may share them someday.
I would not use one of these thermometers as your primary source for anything dealing with water. They are non contact, so you don't know waht you are measuring. Is is the rock, the glass the water surface your fish or your foot? That being said, mine is spot on to what my pinpoint reads and my other digital term. Now, it is not point and shoot accuracy, but by moving it around left to right you find the correct temp. Opening the hood is much more accurate as at the glass well that is what you are possibly measuring.
It is more of a fun toy that also serves as backup, and for the water change bucket. For $25 I couldn't pass it up and gave one away for x-mas. The laser is used to mess with the fish. Oh look my hand is putting off 91°.
The RSM thread on RC is deaaaaaaad now. SO be it, owners should be elsewhere by now and nOObs can do a google search