ITEM NAME:Digital LED Thermometer Car Probe Fridge Freezer Temperature -40~120C Degree DIY Supply voltage: DC4.0 ~ 30V (recommended power supply less than 20V, greater than 20V can string 1K resistance limit) Temperature range: -40 ℃ ~ 120 ℃, The minimum resolution is 0.1 ℃. The standard waterproof temperature probe: 1.5 meters long, PH2.0 interface. Installation hole size: 32.4mm x 21mm 1PCS Digital Thermometer.Temperature range: -40 ℃ ~ 120 ℃, The minimum resolution is 0.1 ℃. Also note that monitor settings may vary from computer to computer and may distort actual colors. Installation hole size: 32.4mm x 21mm.