Stabila STBOLS26 OLS 26 Optical Level Stabila OLS 26 Optical leVelcro with a 26-fold magnification in optical system, no batteries required to use with the focusing and adjusting screw easily accessible. It has a robust IP54 protection rated casing with easy-grip, shock-absorbing soft shell and solid protection of optical unit also in front area. Magnification: 26-fold Minimum focussing distance: approx. 1m Objective lens aperture: 38mm Protection class: IP 54 Standard deviation: View in objective: upright Diameter of field of vision at 100 m: 2.1m Multipication constant: 100 Addition constant: 0 Compensator accuracy: 0,5 Accuracy of height in a single measurement: 1mm/10m Circular vial: 8/2 mm Horizontal circle : Partition degree Increments: 1 degree; Horizontal circle: 360 degree; Supplied with : Optical leVelcro OLS 26, Geo-folding rule 2m, plumb line, rain protection, adjusting tools in robust carry case.