I purchased a new hygrometer and thermometer from petco the other day. According to the salt test, my hygrometer is 7 degrees off. The thermometer is perfect. Well, my incubator is at 99 degrees fahreinheit, but my hygrometer says only 26 (after subtracting 7 degrees). I filled the whole bottom of my incubator with water and it still isnt budging. I have now come to the conclusion that my hygrometer is junk. I am now looking for a digital hygrometer/thermometer. What is the cheapest, most effective thermometer/hygrometer combo and where can I purchase it? Thanks for all and any input.