I have three thremometers in the bator two reg mercuy like themometers and one digital hygrometer and themometer and the digital is less than the two cheap mercury like one's whick should I go by ? THe mercury like one's are reading 101 and the digital one is reading 91 such a diff I don't know what to do . I candled the eggs and I see veins and embryos so they are growing just scared they won't hatch with the problem I am having. Any suggestions?