Analysis instruments for photogrammetric purposes; Automatic liquid-level control machines and instruments; Bubble levels; Electric navigational instruments; Laser diodes; Laser measuring systems; Laser pointers; Laser rangefinders; Lasers for measuring purposes; Lasers not for medical use; Level measuring machines; Plumb levels; Tactical laser sights; Telescopic sights for firearms; Tool measuring instruments; Water level indicators; Levelling rods; Telescopic sights