your incubator is what controls your temps. your egg box is what controls your humidity. my probe is about center in my incubator. I use a herpstat nd. don't use the night drop feature, but this thermostat can be adjusted by 1/10 of a degree at a time. plus it has a high and low level alarms that you also set. and many other features. been using this one about 5 years and it works great.