The BOSCH Optical Level GOL-26D Professional This is a Surveying Tool that is extremely robust, ideal for outdoor use 1.) Designed for outdoor use due to sturdy metal housing with dust and splash protection (IP54) 2.) Robust design with built-in target collimator and integrated circular vial 3.) Compensator lock for safe transport Why this tool? a) Target collimator for rough alignment b) Penta prism makes it easy to read the circular vial c) Large focusing knob for easy alignment d) Fast aperture for excellent staff reading e) High precision (1.6 mm/30 m) over long distances f) Endless degree/angle setting using knobs on both sides g) Friction-Braked Rotation h) Erect image Unit of Measure: 360 degrees Magnification Factor: 26 Leveling Accuracy: 1.6mm at 30m Working Range: Up to 100m IP54 Splash Water Proofed This unit comes together with a Carrying Case, an Adjusting Pin, a Hex Key, a Lens Cover and a Plumb Bob Warranty: 6 months from date of purchase through your nearest BOSCH Service Center