Okay, I put a side the bad thermometer from my last hatch and I have had 6 different ones in there. My problem, 3 read within a degree of each other and the other 3 read within a degree of each other but at 5 degrees higher! Is there a way to test these critters? The first set are two digitals and one instant read. The second set are two mercury medical and an instant read. If there is no way to test them, what would you go by? The medical ones?