Laser level measuring apparatus; Laser measuring systems; Laser rangefinders; Lasers for measuring; Surveying instruments

Hydrometers; Laser detectors for direction; Level measuring machines; Mine probes, namely, elongated rods used to manually probe for covered mines; Plumb lines; Optical apparatus and instruments, namely, optical ports for underwater photography, dome ports for underwater photography, wet diopters, adapter lenses for underwater photography; Range finders; Surveying instruments; Surveyors' levels; Voltage stabilizing power supply