Bean Farm sells a Taylor therm for $15 (I have3) that is very accurite. I have one in a egg box in the middle of the incubator and it is within .1 of my Herpstat thermostat. I lined my three next to each other and they were .1 different in temp and 1% in humidity. I have an atomic digital wall clock that I know is dead on and the Taylors were .1--.2 off. Tatlors have a long sender and even has a humidity fuction. I like it!!! I would also suggest using fresh batteries. I also rotate them out to remotes and such as well. Itsounds like many of us are doing some of the same things. That has to be a good thing I think. Good Luck!