Total chicken rookie here so I will say sorry in advance for any stupid questions that may follow. I built a homeade incubator using the standard styrafoam cooler/light bulb/pc fan/water heater thermostat model. Made my own egg thermometer using an egg shell filled with dish soap, put the probe in and used hot glue to seal the hole. Did a trial run to see if the incubator would get to the proper temperature and humidity. All was well for the first 12 hours. Shortly thereafter the temperature from the probe spiked to 131 degrees F! I have a second cheap non digital thermometer in the incubator which was reading 100 degrees at the same time. Not sure which thermometer was correct I picked the homeade egg thermometer up and it did not feel like 131 F. I believe 130 is the temperature at which skin begins to burn. I had read other posts where people say to calibrate the thermometer but not sure how to do that and the paper work that came with the thermometer did not have instructions on how to do so. I disassembled the egg thermometer and let it cool to room temperature and there is a difference of 31 degrees between what the indoor and out door temperature readings. I concluded the digital thermometer was not accurate and the probe portion of the thermometer was broke. I purchased a second digital thermometer with a probe, that was made by a different company and made another egg thermometer. However, this time instead of using an egg shell I used a ping pong ball figuring it would be close enough. After approximately 18 hours I am having the same problem as I had with the first egg thermometer however I am only seeing a temperature difference of 14 degrees. The first thermometer was an Acurite brand used in a lot of the homeade incubaters i saw on this website and the second is a Springfield brand. Could the problem be the liquid dishsoap media I am filling the egg/ping pong ball with? Has any one else expierenced this? Also just wanted to say I love this site and have been addicted to it since I found it two weeks ago! I think my wife thinks I am going chicken crazy!