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Features: Big Screen, easy to read large LCD characters Always on display for 2 temperatures, clock, and humidity. Built-in temperature sensor for indoor air Built in humidity sensor for indoor air. External NTC thermistor for outdoor or water temperature or wine cooler, with 10-feet insulated wire. Data memories: Session highest(Max) and lowest(min) temperatures; Switch between °C and °F. Desk top free standing or wall mount ready. Powered by one AAA battery(included) Technical Parameters: Temperature range: Indoor: -22 to 122 °F(-30 to 50 °C); Outdoor: -58 to 158 °F(-50 to 70 °C); Accuracy: +/- 1C (between -20, 80 °C), or +/- 2 ° (out side of -20, 80 °C) Resolution: 0.1; Humidity: 30% to 90%, Accuracy 1% Power Supply: 1.5 VDC (one AAA alkaline battery, included); Physical Size: 111 X 101 X 21.5 mm; Display Size: 81.5 X 64.5 mm.