Well I just lost all 44 of my chicks in my incubator due to a defective thermostat/hygrometer... I have 2 of the same brands, 1 in the incubator and 1 in the brooder pen and come to find out the one in my incubator is 19 degrees off! I wrote the company a lovely lil letter about their product and will let you know they reply I get from them. It just really erks me that both of these were brand new products and the bad one ends up being the one in the incubator!!! I guess next time I will put a secondary therm/hygro it my incubator as a second opinion!