only need the thermometer/hygrometer for ambient temps. Ive dialed in hot spot temperatures by using heat gun and adjusting thermostat accordingly. Purpose of the wireless probes is so I don't have to look into each individual bin to check on temperatures i can just look on my phone or computer and see all the bin temps. Also don't want to run any probes inside the tubs to much moving in and out and then a pain when you need to take the bin out for cleaning etc...