I have 4 therms, 3 of which are $30 each and all are giving me a different temp reading. I posted this last night but now my question is ....I know so many sites are sponsored by Brinsea and I have read the same comments over and over about it's accuracy which are usually the marketing words right from the Brinsea ads....but are they really as accurate as they claim? I am so frustrated as I have 12 eggs in the bator. I have no idea how to calibrate a digital therm, in fact I read NOT to put them in ice water etc. I did try (no laughing) taking my own temp with the Brinsea and is registered 98.2. Since humans are suppose to be 98.6 I am leaning towards trusting the Brinsea but wonder why the combo unit I bought yesterday from Petsmart for $30. would be a full 3 degrees lower. I am hoping some of you that own the Brinsea therm could give me some input.