Features: Working voltage: DC 4-28V. Temperature range: -50C ~ 120C. Display and control temperature can be set to 0.1C. Easy installation: Red wire for positive, black wire for negative. Widely used in hatching areas, equipment cases, air conditioning systems, temperature control for protection, and more. Specifications: Material: ABS Type: Annular sensor / rod sensor Operating voltage: 4-30V Voltage measurement: 4-30V, Error: 1.0V (not adjustable) Temperature measurement range: -50C to 120C, Error: 1.7C (not adjustable) Working current: 20mA Temperature sensor: Ring-shaped or rod-shaped NTC 3950 10K 1% sensor, length 100cm Standard wire: XH-2.54-2P red and black wire (thin wire, total length 155mm) Red wire connects to the positive terminal of the power supply, black wire connects to the negative terminal Note: Please allow 1-3cm error due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences between monitor displays, the image may not reflect the actual color of the item. Package includes: 1 x Digital Thermometer