LEICA GPR112.The prism diameter is 62mm, the measuring range is 2000m, the prism angle precision is 3 seconds, the finish is 40-60, and it is mounted on the M8 or 5/8′′ screw. The prism can be adjusted and fixed on both axes. The rain frame protects the prism surface. It is not affected by rain and dust, and can be used normally in rainy days