9 Batteries; Computer peripherals; Headphones; Laser measuring systems; Lasers for measuring; Loudspeakers; Measuring rulers; Optical apparatus and instruments, namely, optical ports for underwater photography, dome ports for underwater photography, wet diopters, adapter lenses for underwater photography; Plotters; Plumb bobs; Surveyors' levels; Tape measures; Tool measuring instruments; Weighing machines; Digital plotters; Electrical plugs and sockets; Electronic plotters; Tape rulers