Indoor/outdoor Or Wine Cooler Aquarium Dual Temperature Digital Thermometer:Model: DT3C; Display in Celsius. USEFUL FOR: 2 areas temperature display, either indoor/outdoor, or air/water, or wine cooler/freezer temperatures. Features: Large And Clear LCD character display Temperature display Built-in sensor for indoor air temperature External outdoor or water/refrigerator/freezer temperature sensor with 10-feet insulated wire. Temperature display in °C.(Note Another model with F temperature, DT3F)Built-in Hygrometer with % display Desk top free standing or wall mountable Technical Parameters: Temperature range: Indoor: -30 to 50 °C Outdoor: -50 to 70 ° External NTC thermistor on 10 ft wire; Accuracy: +/- 1C (between -20, 80 °C), or +/- 2 ° (out side of -20, 80 °C) Resolution: 0.1; Built-in humidity sensor and humidity displayResolution 1% Power Supply: 1.5 VDC (one AAA battery needed); Physical Size: 115×64×19mm; Display Size: 63×43mm. WE SUPPLY HVAC SCHOOLS AND CONTRACTORS! buy it now for only $17.77; free shipping int he US; please check out the other listings in my eCRATER store; more information available athttps://www.viot.us/HVAC