The Thermo 1 is our number one, whenever it comes to fast, easy temperature control of all kinds of heaters in your greenhouse. Thermo 1 you create the required clearances to focus instead on technology auf's gardeners. They use Thermo 1 super easy, with no prior technical knowledge. Plug the heater in question [EK1] simply to the thermal 1 of Bio Green on, make your desire a temperature - and you're done. The probe length is 2.5 meters.