I bought a used Brinsea Octagon 10 on Ebay, and it arrived today. I cleaned in and plugged it in to make sure it was working okay. The light came on, and later started blinking (I didn't notice when it started blinking so I don't know what temp it started doing that) like it's supposed to when it reaches the correct temperature. When I checked it later, it was at 100-101, but my two digital thermometer/hygrometers from Wal-mart read 104 and 106, and the glass Brinsea thermometer kept climbing, too. I adjusted the dial, and the temp on the digital ones came down a little (they take a while to recover, though) and the glass one went down to 97. I decided to unplug the thing and start over, but now the light comes on, starts blinking wayyy before 101 degrees is reached on the glass thermometer, and shuts off completely at 92 degrees, whereupon the temperature begins to fall, and the incubator never come back on. A couple times when I unplugged and plugged it back in, the light wouldn't come on at all. I'm going to contact the seller and see what they have to say about it, but I thought I'd post here, too, and see if anyone here has any advice.