Coils, electric; Electronic controllers used to reduce power consumption; Gasometers; Graduated glassware; Headphones; Mobile phones; Precision balances; Rectifiers; Refractometers; Scales; Switches, electric; Tool measuring instruments; Weighing apparatus and instruments; Electric resistors; Electrical plugs and sockets; Optical apparatus and instruments, namely, optical ports for underwater photography, dome ports for underwater photography, wet diopters, adapter lenses for underwater photo...