Features: Timer Display range: 1:00-12:59 Temperature range: -50 ~ +70 (-58 ~ +158) Accuracy: +/- 1 Temperature above -20 Resolution: 0.1 Temperature below -20 Resolution: 1 Features: The machine looks luxurious and noble, small and exquisite. It is especially suitable for temperature measurement of electrical refrigeration products such as refrigerators, air conditioners and cold rooms, and can also be used for temperature measurement and time display in various occasions such as the home, the office and the automobile. Wide application, simple and convenient operation, intuitive and clear display. Operation instruction: 1. Open the battery cover on the device, place the AAA battery into the correct electrode. FSW is function conversion key, IN means indoor temperature, Out means outdoor temperature. 2. When starting, after the LCD displays 2 seconds, the LCD displays the current indoor temperature. During the 2 seconds LCD display period, the function key will not change state. 3. If you continuously press the FSW function key for more than 4 seconds, the device will turn off, while the clock will keep counting. 4. When the temperature is not lower than 70 (158), the LCD displays H () first, if the temperature is lower than -50 (-58), the LCD displays L () first . 5. If the battery power is insufficient, the LCD screen will flash at the speed of 1Hz, at this time the measurement data is inaccurate, you should change a new battery. 6. Time setting: (1) FSW key: changes LCD display to time display. (2) HR key: add 1 hour by press, more than 12 then count from 1. (3) MIN key: add 1 minute per press, more than 59 then count from 00 Clear the display at liquid crystal, Celsius and Fahrenheit, time display function conversion function, convenient for your reading data and daily use. Dual meter probes for measuring indoor and outdoor temperature.