altimeter altitude table barometer compass thermometer multifunctional outdoor mountaineering machinery

the compass and the small thermometer are just decorative effects. after all, they are too small and the sensitivity is not high. to use these two functions, please go to the store to search for professional compasses and thermometers.. Â first, the product introduction 1, the physical principles of the design and application of this product: (1) the pressure decreases with increasing altitude; Â (2) changes in air pressure will cause changes in the weather,