Large diameter outer diameter of the measuring instrument LPDJ series of large diameter outer diameter of the measuring instrument is the angle between the tangent plus fixed roof height measurement principle to measure the outside diameter trees handheld measuring instruments. Instrument compact, accurate measurement, and has a diameter - switching perimeter. Technical parameters: 1, range: 600-1000mm (LPDJ60-100) 1000-2000mm (LPDJ100-200) 2000-4000mm (LPDJ200-400) 2, Accuracy: 0.5mm 3, Temperature: -20 ~ +40 ℃