Material: hard zinc alloyMain Functions：Basic positioning, measuring azimuth, deflection angle, it's easy to read data in all weather at any time, excellent for camping, hiking, exploring, and other outdoor activities.Specification：Dimensions: Diameter45mm.Easy to carry：The compass is medium in size and easy to carry. It is recommended to put it in your pocket, backpack or directly on your neck so that your direction will always be correct.Applicable occasions and people：This compass is waterproof and shockproof, suitable for driving, camping, hiking, adventure, and other outdoor activities, so this compass is a good tool for backpackers, campers, hikers, hunters, geologists to do outdoor activities.Weight: 200g.Composition: liquid damping compass plate, magnifying glass, copper wire aiming shaft, rotatable magnifying glass andPositioning line, American reverse buckle.product manual:liquid damping meter.