Noisemeters; Burglar alarms; Circuit breakers; Electric light dimmers; Electric plugs; Electrical connectors; Electrical outlets; Infrared sensors; Length measuring gauges; Proximity sensors; Resistance measuring instruments; Safety sensors, namely, carbon monoxide detectors, smoke detectors, and combination carbon monoxide and smoke detectors; Scientific instrumentation for measuring weight, chemical levels in water; Smoke detectors; Surveying instruments; Switches, electric