Ok...thanks for the advice. BTW the glass thermometer I am using has a range of 80 to 105. It also is stored in a clear plastic tube.It is made for incubator use.
http://i154.photobucket.com/albums/s...3/P7100003.jpg
Here's a clutch I just hatched at 89 degrees using the glass thermometer as a reference. 10 eggs 7 spiders 3 normals. I don't think it's off by much,if at all.
http://i154.photobucket.com/albums/s...3/babypic6.jpg