I like the herpstat nd for incubators. the nd has high and low alarms that beeps when temps are out of range, which you can set how much over and under the incubating temps before the alarms go off. plus the herpstat is adjustable at 1/10 of a degree and the helix is 1 degree.

your heat tape, I put heat tape in mine and test ran it with thermometers in the top and bottom. ran it and had to cut the heat tape a couple of times before I got the temps high and low where I wanted them. remember heat rises