Never before has this level of sophistication been available to home brewers in such a sleek, compact, and easy to use device. All you need to do is choose your target temperature (mash tun or hot liquor tank) and the Control Module will do the rest by automatically turning on/off your burners (natural gas or propane) till the desired temperature is reached. Accurate and precise temperature control held to 0.5° F (0.25° C). Buy a second one and control both your mash tun AND your hot liquor tank.