I have been trying to hatch eggs for some time now and after multiple failed attempts I decided that I have to be doing something wrong. I researched the topic for days without seeing any clue as to what I could be screwing up. I kept telling myself "You are missing something and it is going to be something simple". And it was! I have always used the same digital thermometer on each blunder, so I decided to check it. Being at the end of my rope I purchased and new one and checked it against the old. While the old one read 99.5 the new one read 107.1. I could have kicked myself in the arse. I have read in several different threads and other sources to try this many times. I am unsure to why I always just ignored the advice, but I did. So, take it from me, checking your thermometer/hydrometer may seem redundant but it's not, especially if you are having problems. I hope that this will save someone the frustration that it has caused me! If you are having a problem and you think it's something simple, it probably is! Happy hatching!