My problem is this. I am using my sister's incubator and she bought me her favorite thermometer (not digital). I've purchased an indoor / outdoor digital therm. and also put in my husbands digital BBQ meet therm. in a water wiggler. Her therm is saying 100 but both of my digital therms are saying 96. She has used her's with 3 others and says this one is the best. What should I do? Leave or beleive the two that are running the same? There is a 3 degree difference. HELP!