2 Pcs Card Rangefinder Odometer Multifunction Compass Curvimeter Device, Opisometer, Curvimeter, Distance Calculator Map Measurer Compass Hiking Camping for Outdoor Survival Ephe

General DescriptionThe multifunction odometer rangefinder is an essential tool for outdoor activities such as hiking, camping and cycling. It can accurately measure the actual distance of curved routes on a map. Easy to use, simply place the mini metal wheel on the card and roll it to get accurate measurements.Technical specificationsNet weight: 20.6gGross weight: 24.5gProduct size: 9.5 x 4.5 x 1cmMaterial: high quality metal and plastic shellProduct color: white, yellowUsageTo use the measuring instrument, place the wheel between two points on the card. The distance measuring pointer will rotate accordingly. Record the value according to the corresponding scale and multiply it by the scale factor to get the actual distance.This tool is designed to measure actual distances on curved routes, providing higher accuracy than a ruler. Other information Precautions for use: Use in a horizontal state to ensure accuracy. Keep away from barbed wire and magnetic objects to avoid confusion of the magnetic needle. Do not hit objects with the surveying ruler to avoid affecting accuracy. Keep the disk surface and lens clean. Close the device when not in use. used and place it away from ferromagnetic substances to avoid loss of magnetism.