you can't go wrong with the herpstat 4. I use one. I control 3 different racks systems with it and I also have the humidity sensor to control the humidity in my room. I also have a few herstat nd. great for the incubator, great for racks too. and I have a few helix, not many features on them, but been used for years in the reptile community. my next thermostat will be another herpstat 4. the herpstat 4 sounds to be what your looking for in a thermostat. good luck don