I have been using these two thermometers in my incubator. Removed them for the picture. The digital one has started showing lower and lower temps but the other has stayed consistent and at 99-100. The thermostat temp on the incubator itself shows 38*C when not disturbed. So I'm assuming that the incubator is maintaining the correct temp but what would make the digital one show incorrect temp? I used it for my last incubation with no problems. If battery was low wouldn't it just stop working? Puzzled. I like looking in and seeing same temp on both thermometers!