Distance Meter can help you quickly calculate the distance by measuring the distance between two points on the map. The map measuring tool is made of a metal and plastic case of high quality, strong and hardwearing, rainproof and durable. Makes a great gift for anyone who loves the outdoors. Suitable for outdoor use, camping, hiking, cycling, hunting and more. The map distance tool is easy to use, just roll the mini metal wheel over the map and the pointer will display the exact scale. This map measuring wheel is lightweight for easy portability and features a mini metal handle for easy grip. product material: : metal, ABS, acrylic product weight: : 20 grams (product net weight), 27 grams (including packaging) Product size: 95*45*12mm Package size: 102*57*13mm dial diameter: : 40mm Packing method: : PP bag, color box How to use the measuring instrument: When the scroll wheel rolls between two points on the map, the distance measuring pointer rotates accordingly and records the value according to the corresponding scale, and multiplies it by the scale coefficient to obtain the actual distance between the two points, compared to the distance measured with a ruler Straight line distance is much more accurate; The map distance meter is convenient and quick to measure distance by mileage, and it is specially used to measure the actual distance of the curved route on the map.