Cyclocomputers; Microscopes; Continuity test apparatus for electrical circuits; Depth gauges; Digital multimeters; Electronic devices for measuring electric current; Flasks for laboratory use; Gas testing instruments; Instruments for measuring length; Level indicators; Metal detectors; Optical apparatus and instruments, namely, optical ports for underwater photography, dome ports for underwater photography, wet diopters, adapter lenses for underwater photography; Satellite finder meters; Soil...