Item Type: Digital Temperature Controller_x000D_ Temperature Control Range: -50-120_x000D_ Input Voltage: AC110-220V_x000D_ Operation Method: _x000D_ Connect the power supply and equipment to supply power to the controller. At this time, it is displayed as measuring temperature. Press the SET key once, and the temperature on the display screen flashes. Press+ - to SET the required temperature (press+ - to quickly rise and fall). After the setting is completed, press SET to confirm and return. At this time, the controller will press the setting to automatically turn on and off the relay! The output of the temperature controller is a 20A relay to meet various high power loads. After the control circuit is connected, power can be supplied to the temperature controller. At this time, the display screen shows the ambient temperature._x000D_ PO Cooling and Heating Mode: _x000D_ Press and hold SET for 5 seconds to display P0, press SET once to SET5 the working mode, and press+- to switch. H is the heating mode and C is the cooling mode. Press SET once to return. Press SET for a long time or press SET for 10 seconds. The controller automatically confirms the completion. Under refrigeration mode: When the temperature measurement value is the temperature set point, the refrigeration relay is closed and the refrigerator starts; When the temperature measurement value s temperature set point return difference, the refrigeration relay is disconnected and the refrigerator is closed._x000D_ P1 Return Difference Setting: _x000D_ Press and hold SET for 5 seconds to display P0, press eleven to switch to P1, press SET once to set the return difference, press eleven to set the return difference to 0.1-15, press SET once to return after completion, press SET for a long time or press the key free action controller for 10 seconds to automatically confirm the completion._x000D_ In Cooling Mode: _x000D_ When the temperature measurement value is the set value, the relay is closed and the cooler starts; When the temperature measurement value the set value return difference value, the relay is disconnected and the cooler is closed.