I bought that exact one and returned it 2 days later. IMO it's really a bad one. Do you know how to calibrate a thermometer? Fill a plastic cup with ice and add a little water. Let it melt for like 2 mins and stick the meat thermometer in. It should read 32 degrees. That's the easiest way. If it's over or under 32, you know that it's off by that much. Be careful. When you turn up the temp it will spike up to 103 or higher and cook your eggs. It's really a hard one to get to stay steady. Did you buy the auto turner? Do not trust what the digital read out says. I had it at 104.5, just to get to 101 and the temp would bounce up and down.