Multi-Functional 4 in 1 Digital Mini Compass Digital Barometric Altimeter Compass Weather Forecast Thermometer Hygrometer Barometer for Outdoor Hiking Camping MULTI-FUNCTIONAL 4-IN-1 - Includes altimeter, barometer, compass and thermometer.Ideal tool for mountain climbing, rock climbing, camping, hiking, hunting, skiing and any other outdoor sports CONVENIENT TO USE - Battery-free, maintenance-free and portable. Comes with a carabiner, convenient to carry.Always makes you ready for weather changes with weather forecast function;With compass, thermometer and hook, satisfies all requirements in sports PRESSURE INCREASES WITH DECREASING ALTITUDE - Changes the air pressure will lead to changes in the weather , this change will be displayed by the high-precision gear altimeter on this dial . This device can accurately measure the position of the height ( absolute height ) , the height difference , atmospheric pressure and predict changes in the weather STORAGE CONDITIONS - The temperature is between -30 and 65 degrees, and the humidity is less than 90%.Barometer pressure range: 600~1000hpa ;Temperature measuring range: -30~50 C ;High accuracy: 20m ;Temperature accuracy: 2 C 100% SATISFACTION CUSTOMER SERVICE - Suitable for outdoor activities such as mountaineering, rock climbing, hiking, skiing and other outdoor activities are used to increase and cultivate the fun and power of outdoor sports. Forecast the future weather according to the barometric value, let you face the weather changes calmly, and win the best at any time and anywhere.Package: 1 sets (1 Barometer Altimeter +1 compass +1 carabiner) ;Lifetime warantyy