Features: Working voltage：DC4-28V. Temperature range：-50 °C-120 °C. The display and control temperature can be set to 0.1°C. Easy installation: Red wire for positive, black wire for negative. Widely used in the hatching area, equipment-case, air-conditioning-system, temperature control-protectionc. Specifications: Material:Plastic Type: annular-sensor/rod sensor Operating voltage: 4-30V Voltage measurement: 4-30V Error: ±1.0V (not adjustable) Temperature measurement range: -50℃-120℃ Error: ±1.7℃ (not adjustable) Working current: equal or less than 20mA Standard wire: XH-2.54-2P red and black wire (thin wire, total length 155mm) Red line-is connected-to the positive pole of the power-supply, and the black-lines is-connected to the negative pole of the power-supply Package Includes: 1x Digital Thermometer note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.