Complete machine patch, wave soldering, stable performance, good consistency. Embedded CPU chip (MCU), more intelligent, lower power consumption. Automatic power set memory (MCU built-in EEPROM memory unit). Control accuracy of 0.1 degrees Celsius. Have been tested for stability, consistency and reliability. Specifications: Model: W1209 Temperature Control mode: ON / OFF Temperature Range :-50 - 110 degree centigrade Resolution: When temperature is 0.1 degree, the resolution is -9.9~99.9, other temperature segment is 1 degree. Control Accuracy: 0.1 degree Hysteresis Accuracy: 0.1 degree Refresh Rate: 0.5s High Temperature Protection 0 - 110 degree centigrade Supply Voltage: DC 12V Static Current: Less than 35MA, attract current less than 65MA Output Voltage: DC 12V Output Power: 20A relay Measurement Input: NTC (10K 0.5%) Waterproof Sensor Environmental Requirements: -10 - 60 degree centigrade; Humidity 20% - 85% Colour:Green Material:Plastic + Metal Size:48.5x40mm Package Contents: 4 x Digital Temp Controller 4 x shell Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.