Survey Instrument For Sale Sokkia Auto Leveling SystemProduct Details:ModelB40 B30 B20TelescopeLength215mm(8.46 inch)Objective aperture32mm36mm42mmMagnification24X28X32XImageErectResolving power4"3.5"3.0"Field of view(at 100m)1° 25′ (2.5m)1° 20′ (2.3m)Minimum focussing distance0.2m (7.9in.) from end of telescope 0.3m (1ft.) from instrument cener.Reticle patternCross hairswedgeStadia ratio1Military Apparel 00Stadia constant0sighting aidGun sightPeep sightFocusing Knob1-speed2-speedLense hood-RetractableAccuracy(standard deviation for 1km double run leveling)Without miOther Electronics crometer2.0mm1.5mm0.7mm (0.08in.) (0.06in.) (0.03in.)With micrometer0.5mm (0.02in.)CompensatorTypependulum compensator with magnetic damping systemWorking range± 15′Setting accuracy0.5"0.3"Horizontal CircleDiameter103mm (4.1in.)Graduation1°/1gonGeneralSeGrinder nsitivity of circular level10′/2mmMirror for circular levelPlane mirrorpentaprismHorizontal motion driveClampless, endless, double-sided knobsWater resistanceIPX6(IEC60529)Operating temperature-20-+50°C (-4 to +122°F)Size122mmx 215mmx 135mm130mmx 215mmx 140mmWeight1.7kg (3.7 lb.)1.85kg (4.1 lb.)