Optimum sighting range: Recommended job range up to 200 feet. Accuracy range: Recommended for jobs requiring accuracy within 1/4" at 75 feet. TELESCOPE Power 22X Length 10.5" (26.5cm) Minimum Focus 4 ft. (1.2m) Aperture .75" (19mm) Field of View 2' @ 100' (.6m @ 30m) No. of Lenses 6 HORIZONTAL CIRCLE Graduation Diameter 3.62" (92mm) Graduations Each 1° Numbers Each 10°, 0-90-0° Vernier Double direct to 15 min. VERTICAL ARC (LT6-900N only) Graduations Each 1° Numbers Each 10°, 45-0-45° CENTER Planar bearing LEVEL VIAL 10 min. per 2mm WEIGHT L6-20N LT6-900N Instrument only 3.25 lbs. (1.5kg) 4.5 lbs. (2.0kg) Instrument, case, 3 oz. plumb bob 6 lbs. 6 oz. (3kg) 7 lbs. 10 oz. (4kg)