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Operation Manual. Digital Thermo-Humidity Meter. 1 Specification: Temperature Range: Indoor：-10℃～+50℃ (+14℉ ～ +122℉) Outdoor -50℃～+70℃ (-58℉ Thermo Hygrometer User Manual Temperature measurement accuracy:±1℃(1.8℉) 1. Installing the battery. 2. Key functions:【MODE】Switching clock and Main Features: 1. LCD Display. 2. Calendar. 3. Hourly Alarm. 4. Daily Alarm. 5. Time display12/24hours. 8. Temperature display C° / F°.HTC-1 Hygrometer Operation Manual. Digital Thermo-Humidity Meter. 1. 3-1 Remove battery compartment cover, insert 1xAAA battery, replace the cover, Click here to download instruction. Product details. Specifications: Temperature range: -50°C~+70°C (-58°F~+158°F) Temperature accuracy: ±1°C (1.8°F) This HTC-1 meter can measure indoor temperature, humidity and time with reliable List:1 x Temperature Humidity Meter1 x User Manual 1 x AAA 1.5 battery.