I'm glad you had good luck with yours,. I hooked up a digital thermometer with min/max memory on mine after setting the incubator to 88 Deg F and running it for several days. I found that the temps varied from 85 degrees F as a low to 95 degrees F as a high. I was incubating leopard geckos at the time and I had many eggs that did not hatch.

Personally I think a better cheap incubator is a hovabator plugged into a good quality proportional thermostat.