Elevation measuring / Elevation measuring

This kind of altitude meter is designed for the climber, it set up a reference line from the picture, can directly see the climber in a position from the height of the reference line. Open to open the key, on the screen touch down set reference line (words from black to red), and then it can be used, the operation is not trival, suitable for the climbers, and there are interesting; Circular button is charging open key, convenient accumulator. In general, the design is concise, simple and easy; Small volume, easy to carry.