Features: This product is an upgraded version of W1308. Added Celsius and Fahrenheit conversion function Fully sealed, waterproof and safer Application: Refrigerator freezer, display case temperature control, plastic greenhouse, incubator, medical equipment, pet house, planting and breeding, electrical control cabinet cooling, ventilation containers, reptile insulation, EPS incubator, sauna, PC enclosures, civil and industrial equipment Easy and convenient to use Specifications: Temperature Control Range: -50 - 120°C Measurement Accuracy: 0.1°C Control Accuracy: 0.1°C Hysteresis Accuracy: 0.1°C Refresh Rate: 0.5S Input Power: AC 110V - 220V Measurement Inputs: NTC (10K 0.5%) 0.5M Waterproof Sensor Output: 1 Output Channel Relay, Capacity = 10A Environmental Requirements: -10 - 60° Humidity 20%-85% Size: 10*4.8*2.5cm Working Light: Red Package Included: 1 x Temperature Control Switch - Celsius and Fahrenheit User Guide Press and hold the C/F button for three seconds, C mode will be changed to F mode, the corresponding indicator light is on, and then the C/F button is pressed for three seconds. Mode F is changed to Mode C, the corresponding indicator light is illuminated and the shutdown function is saved. Quick setup 1. Specify Mode Press and hold SET for about 5 seconds to display P0, press SET again to display the mode. Press +-switch mode, H is heating mode, C is cooling mode 2. Set the difference: Hysteresis is also how much it drops when the set temperature stops. The default is 2 If you want to modify, press and hold SET and let go for about 5 seconds to display P0, press +- to switch P1, press ST again to display the difference, press +- to set the difference back. 3. Set the temperature: After setting the mode and hysteresis, press ENT to confirm the return. During this time, the screen displays the temperature in real time. Press the SET screen button once and press the +- button to set the desired temperature. Table code P0: working mode (range: H/C) (default: C) P1: hysteresis setting (range: 0.1-30) (default: 2.0) P2: setting limit is high (range: +120) (default: 120) P3: setting low limit (range: -55) (default: -55) P4: temperature correction (range: +10-10) (default: 0) P5: delayed start (range 0-10 minutes) (default: 0) P6: high temperature alarm (-55 - 120) (default: off) P7: Data lock (on - off) (default: off) P8: restore factory settings (on - off) (default: off) In the off state, press and hold the up and down keys to quickly restore the factory settings.