Waterpass Sokkia B20

Specifications Model B20 Telescope Length 215mm ( 8.46in.) Magnification 32x Objective aperture 42mm ( 1.65in.) Resolving power 3" Field of View ( at 100m/ 328ft.) 1° 20' ( 2.3m / 7.5ft.) Minimum focus 0.2m ( 7.9in.) from end of telescope 0.3m ( 1ft.) from instrument center Image Erect Reticle pattern Wedge Stadia constant 0 Stadia ratio 100 Focusing knob 2-speed Sighting aid Peep sight Lens hood Retractable Accuracy ( standard deviation for 1km double run leveling) Without micrometer 0.7mm ( 0.03in.) With micrometer 0.5mm ( 0.02in.) Compensator Type Pendulum compensator with magnetic damping system Setting accuracy 0.3" Working range ± 15' Circular level Sensitivity 10' / 2mm Mirror Pentaprism Horizontal circle Diameter 103mm ( 4.1 in.) Graduations 1° / 1gon General Horizontal motion drive Clampless, endless, double-sided knobs Water resistance IPX6 ( EC 60529: 2001) Operating temperature -20 to + 50° C ( -4 to + 122° F) Width 130mm ( 5.12in.) Length 215mm ( 8.46in.) Height 140mm ( 5.51in.) Weight 1.85kg ( 4.1 lb.) 1x Unit Sokkia B20 1x Alumunium Tripod 1x Levelling staff / Rambu Ukur