. Great rack! Chris makes quality incubators as well. What you can do is tape your thermometer probe to the outside and back of the tubs on each level and get your temp readings like that. Of course this will be a test run. Then once you've gotten a sense of the temps on each level do the same test run but just put the probes on the inside of the tubs and get those readings. This way you can decide how to set the thermostat so your temps are more accurately where you want them on each level. And this will be done before you set up your animals accordingly.