KNACRO 20-90&deg;C Digital Temperature Controller Heating Cooling Thermostat Switch DC 12V High Precision Digital temperature control switches. STM8 high professional temperature control chip. Used in the (liquid, mold, space) and other control heating,Can also be used (box, the device, water, pet rooms, air conditioning) and other control refrigeration. Small size, easy installation, precision temperature control, adjustable hysteresis.