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Temperature range: Indoor: -10 to 50 Celsius degree (14 to 122 Fahrenheit). Outdoor: -50 to 70 Celsius degree (-58 to 158 Fahrenheit), (if the meter have an outdoor temperature sensor). Humidity range: Indoor 20% ~ 99% rh (when the humidity < 20%rh, display 10%rh directly). Operations: 1. Open battery compartment cover, take out the polarity insulator, put on the cover, then the meter starts to work. 2. Button function: (Mode) exchange display mode of clock and alarm, set current time, alarm, 12h/24h display and date. (Adj) adjust the value of what is under setting. (C/f) change temperature unit between Celsius and Fahrenheit. (Reset) delete all values set and in memory, all values return to the original. (Memory) press to display memorized max and min values of temperature and humidity. 3. In status of original, press and hold (mode) for 2 seconds, the minute value flashes, press (adj) to adjust value of minute, press (mode) continuously, can adjust value of hour, 12h/24h, date (d), month (m) respectively. 4. Under mode of clock, ': ' Between hour value and minute value flashes every second, press (mode) one time, change clock mode to alarm mode, then ': ' Between hour value and minute value does not flash, now, press (adj) button, can switch on/off of alarm function and hourly alarm () function. Press and hold (mode) for 2 seconds to set up alarm time. 5. Under mode of alarm, the meter will return to clock mode if there is no any operation in 1 minute. Press (mode) one time, change the display to date and the meter return to clock mode automatically in 3 seconds. Attentions: 1. Press (reset) button for one time when the meter is first used or the battery is replaced. 2. Press (reset) button for one time if any abnormal display appears.

Hongville Digital Large LCD Display Temperature Humidity Thermometer Home Comfort Monitor Indoor/Outdoor - B0716JB93B