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 for , air-conditioning-system, temperature control for , etc. Operating measurement: 4-30V Error: ±1.0V (not adjustable) Temperature measurement Working current: equal or less than 20mA Temperature Standard wire: XH-2.54-2P red and black wire (thin wire, total length 155mm) is to the positive pole of the power supply, and the black line is to the negative pole of the power supply Colour:Black Material:plastic type:A: ring sensor Package Contents: 2 x Digital Thermometer 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.