Laser measuring systems; Laser detectors for ruler; Laser doppler for measuring purposes; Laser equipment designed for cutting, drilling, marking, engraving and shaping optical lenses for eyeglasses; Laser equipment designed for engraving and tinting optical lenses for eyeglasses; Laser pointers; Laser speed detectors; Lasers for measuring; Lasers for measuring purposes; Level gauges; Level indicators; Level indicators; Level measuring machines; Level switches and level indicators for monitoring and controlling liquids in tanks and vessels; Level switches for monitoring and controlling liquids in tanks and vessels; Levelling rods; Measuring apparatus, namely, laser distance meters; Automatic liquid-level control machines and instruments; Carpenter's levels; Filling level detectors; Handheld electronic units for adjusting sound levels in hearing aids; Liquid level sensors; Measuring apparatus for temperature and humidity levels in gases and solid substances; Oil level sensors; Pre-recorded CDs, video tapes, laser disks and DVDs featuring ruler; Red LED laser pointing devices that contain a subtle energy field; Rescue laser signalling flares; Scientific apparatus, namely, sensing and signaling devices for measurement and quality control of materials processing by laser; Sound level meters; Spirit levels; Tactical laser sights; Water level indicators; Water tank level gauges