Do not buy this thermostat. I connected it up, because my old one was warn out, and was ok for about a day. After that it showed err on the screen, and the temperature just went up, and up, and up and up without me knowing. I had 9 Rhea eggs in that the time, and they were just the hatch in a few days time. I managed to save one rhea but the rest were cooked. To show how hot it was, the chicken eggs that i put in there were hard boiled. The insides of my incubator is pretty much knackered.
Ihave reset it, and all is working how it should, but it just cant keep it at a steady temperature. It sometimes keeps it at steady 37.4 - 37.5 which isnt bad, but at times it will get to over 40 degrees!!! Adjusting the temperature sometimes makes no difference, and will still manage to let the temperature get to 40+ even when it is set at 34. One other thing is it will forget things.
On the plus side it has a clear LED screen showing the incorrect temperature by about 4 degrees (checked with 3 rather expensive thermometers)
Stay well away from it. I have just lost all those baby rhea, and only have the one surviving.
Guy