RM19815329840880900 Name: altimeter with compass and thermometer Weight: 180 grams 1. Measuring range: (altitude) 0-5000 meters; (air pressure) 580-1040 hPa; (temperature) - 30-50 degrees C 2, resolution: 20 m 3, specification: length 85 × width 68 × height 28mm, disc diameter 60mm 4, storage conditions: temperature from -30 deg; C 65 deg; C; Humidity less than 90% Product Overview: this product is a barometer altimeter, built-in sensitive pressure induction device, can measure the position of atmospheric pressure value in real time; Due to the principle of inverse ratio of altitude and atmospheric pressure, can be used to measure relative altitude; After altitude correction, you can also measure altitude in real time. This product is widely used in air pressure measurement, as well as mountaineering, fishing and other outdoor occasions, but it is not recommended for geographical survey! Please see the graphic below for details. The compass and the small thermometer are just decorative functions, after all, too small, the sensitivity is not high to use these two functions, go to the store to search for a professional compass and thermometer. I. Introduce