Features: Working voltage:DC4-28V. Temperature range:-50 C-120 C. The display and control temperature can be set to 0.1C. 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 Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Digital Thermometer