Air quality measurement apparatus, namely, particle counters; document printers for printing documents; barcode scanners; battery chargers; biometric identification apparatus; cameras; carbon monoxide detectors; computer network interface devices; electronic card readers; electrical sensor apparatus for sensing the presence or absence of individuals or objects by contact or pressure; environmental monitoring system comprised of sensors that measure pressure, humidity, and temperature; fall protection equipment for fall restraint and for fall arrest, namely, lanyards, harnesses, lifelines, body belts; fire alarm and emergency evacuation devices, namely, fire alarm control panels, fire and smoke detectors, heat detectors, alarm pull stations, audible and visible notification appliances, strobes, sirens, bells, chimes, microphones and speakers; gas detectors for detecting the presence of gas; gloves for protection against accidents or injury; hand-held 3D scanners; hard hats; keypads for use with programmable locking systems; light systems comprising light sensors and switches; lighting control apparatus; mobile computers; noise cancelling headphones; protective gloves for industrial use; protective helmets; protective industrial boots; RFID readers; safety eyewear; safety harnesses other than for vehicles or sports purposes; security control panels and motion detectors; computer servers; smoke hoods; thermostats; touch panels; vibration sensors; video recorders; virtual reality glasses, headsets and goggles; workmen's protective face shields