**4-in-1 Compass Barometer Thermometer with Carabiner Clip - Portable Outdoor Survival Tool for Hiking, Climbing, Camping & Backpacking Adventures**

Product Description Use introduction 1. Height measurement The altimeter should be initialized before use (or after purchase) (see the figure above for operation), that is, adjust the altimeter number according to the actual local altitude. At this time, please note: please refer to the altitude marked on the map (you can also check the local altitude online , The local weather bureau) to calibrate the exact altitude of your location, so that the reference altitude value can be constantly compared during climbing or walking Example: Check with the Meteorological Bureau that the altitude of point A at the starting point is 200 meters, and adjust the altimeter pointer to 200 scales. When it reaches position B, the dial scale is 1500, and the altitude of point B is 1500 meters. 2. Relative height In the process of climbing or marching, if you need to measure the height of the environment, please follow the following two steps: (1) Initialize the altimeter at the starting point, (2) During driving or at the end point, the scale value displayed on the dial is the height value relative to the starting point technical parameter 1. Measuring range: (altitude) 0 to 5000 meters, (air pressure) 580 to 1040 hPa, (temperature) minus 30 to 50 degrees 2. Weight: 110 grams 3. Specifications: length 85×width 68×height 28mm, dial diameter 60mm 4. Storage conditions: the temperature is between -30 and 65 degrees Celsius; the humidity is less than 90%