1.Metal construction 2.Measure azimuth,distance,slope, height,mileage,simple map 3.Be used at night DQL-7 Military ... compass 1.Metal construction 2.Measure azimuth,distance,slope, height,mileage,simple map 3.Be used at nightThe main function of ... of pitching and calibrating level. Also it can measure the mileage between teo arbitary points in map and the coordinate of ...