filters for non-medical respiratory masks; respirators for filtering air other than for artificial respiration; protective masks; protective masks in the nature of masks that protect the wearer from smoke; gas masks; industrial protective masks; temperature indicators; temperature meters not for medical use; manometers; pressure gauges; vacuum gauges; tachometers; flow meters; barometers; pneumatic gauges, namely, pressure gauges; anemometers; pressure indicators; photometers; optical density meters; photographic exposure meters; gas flow monitors; gas flow meters; gas flow indicators; automatic turbidimeters; atmospheric oxygen monitors; concentration meters; oxygen concentration meters; gas meters; exhaust meters; electric, electronic, or electrochemical oxygen monitors and sensors for environmental use; oxygen detectors; hygrometers; flowmeters; gasometers; gas pump meters; accelerometers; thermometers other than for medical use; alcoholmeters; alcohol concentration meters; pedometers; diagnostic apparatus for testing food; food analysis apparatus in the nature of food safety monitoring devices, namely, thermometers and alarms; gas testing instruments; precision measuring apparatus, namely, laser measuring systems; meteorological instruments; digital meteorological station device; residual gas analyzers; flue gas analyzers; residual and flue gas analyzers; chemistry apparatus and instruments, namely, beakers and test tubes; telephone apparatus; transceivers; handheld transceiver; interphone; radiotelephony sets; car phones; facsimile machines; mobile phones; cell phones; smartphones; cordless telephones; mobile telephones; portable telephones; video phones; digital phones; voice over internet protocol (VOIP) phone adapter; internet phones; internet device, namely, mobile hotspot devices; walkie-talkies; apparatus for transmission of communication; wireless communication devices for voice, data or image transmission; communication devices, namely, telephones; telephones incorporating intercommunication systems; intercommunication apparatus, namely, intercoms; smartglasses; smartwatches; connected bracelets, namely, wearable activity trackers; motion detectors; wearable activity trackers; wearable motion tracking devices; portable and handheld digital electronic devices for recording, organizing, transmitting, manipulating, and reviewing text, data, image, and audio files; electronic devices, namely, energy meters for tracking and monitoring energy usage; wearable electronic devices, namely, wearable computers in the nature of smartwatches and smartglasses; virtual reality glasses; smart rings; computer hosts, namely, servers for web hosting; data processing apparatus; data processing equipment, namely, couplers; calculating machines, data-processing equipment and computers; programmable data access processors; notebook computers; downloadable mobile applications for use in database management; downloadable computer programs for use in database management; downloadable software applications for use in database management; computer software for use in database management that may be downloaded from a global computer network; computer application software for use in database management; downloadable software application for use in database management; downloadable computer software for use in database management; personal computers; computer game software; computer game programs; recorded computer game programs; downloadable computer game programs; tablet computers; electronic pens; computer hardware; touch panels; dust masks; divers masks; scuba masks; swim masks; scuba diving masks; oxygen masks not for medical use; skin diving masks; protective face masks not for medical purposes; luminoflux meters; acoustic meters; pH meters; water meters; electric meters; sound level meters; electrotechnical vibration meters; digital pH meters; electronic testing equipment, namely, sound level meters; scientific measuring instruments, namely, conductivity meters; measuring apparatus, namely, laser distance meters; measuring apparatus, namely, clamp meters for measuring electricity; electronic devices, namely, handhelds for exchanging data in energy meters or submeters; environmental monitoring system comprised of meters and sensors that measure pressure, humidity, temperature and includes alarm and reporting functions; panel meters, namely, an electronic instrument that displays an input signal in either a digital or analog form; centrifugal metering pumps; metering orifices, namely, orifice plates for metering or controlling the flow rate of liquids; battery powered meter for measuring the moisture content of coffee beans; electrical energy utilization metering devices complete with related software; wireless controllers to remotely monitor and control the function and status of other electrical, electronic, and mechanical devices or systems, namely, remote metering systems, gas and liquid cylinders, vehicle tracking devices, energy and utility systems, security systems, lighting systems