Map Rangefinder Odometer Multifunction Compass Curvimeter Outdoor Climbing Sport Description: How to use the measuring device. When the rolls between two points on the map, the distance measuring pointer turns with it, record this value according to the corresponding scale and multiply it by the scale factor, you can get both the actual distance between the two points, which is much more accurate than the straight line distance measured with a ruler; the map rangefinder measures the mileage distance conveniently and quickly, specifically for measuring the actual distance of curved routes on the map. Cautions. 1. use in a horizontal position to ensure as much accuracy as possible. 2. To avoid misalignment of the magnetic , please keep a certain distance from wire mesh, and objects containing magnetism when using it. 3. Do not strike the object with the measuring , as this may affect the accuracy of the measurement; 4. Keep the disc surface and lens clean, do not use a dirty cloth or hand to wipe; 5. should be closed when not in use, placed not near ferromagnetic substances, so as not to lose magnetic. Specifications: Name: Mapmeter ColourBlack Weight32g MaterialAluminium alloy ABS acrylic Packaging: white box packaging Use: Rangefinder Package Included: 1*Compass