I was in the middle of a hatch with my brinsea mini adv when it started going whacky with the read-out and the temp was running up and down like crazy. It finally quit working all together . I loved using this incubator so much I put the eggs into the brooder to hold them over while I made a incubator from a hard cooler, using a light bulb, a couple computer fans and a lower hot water thermostat. I've made one like this before and it worked..ok. This one is holding the heat better but the thermostat I found only goes down to 110. So I also bought a dimmer switch to control the light bulb. Everything is working ok but really the only control I have on the temperature is how close to the bulb I put the thermostat. If i turn the dimmer switch down, the temp in the incubator actually goes UP! I don't get it. And I have to worry about hot spots in the incubator. I think the light bulb should go on the top for next time. Viewing window on the side. I bought a thermometer with an outdoor probe and I think it only measures in increments of .8. How dumb is that. I have a fish tank thermometer inside a bag of water and it seems to be holding about 100 and another thermometer holding just under. I miss my brinsea These poor eggs have been baked and frozen now but when we candle they still seem to be growing. They have a week left to go. Actually less now, tuesday is hatch day.