35 Online retail services, namely, online sale of pressure measuring apparatus, pressure gauges, pressure sensors, pressure transmitters, pressure indicators, pressure recorders, pressure switches, not being parts of machines, being pressure switches for monitoring and controlling the pressure of gases or liquids, namely, pressure controllers for controlling the pressure of liquid and gaseous substances in industrial processes and pressure indicators sold as a unit; pressure switches and sensors for monitoring, controlling, and switching hydraulic or pneumatic systems; combination pressure switch and gauge comprised of pressure gauges and pressure switches for monitoring, controlling, and switching hydraulic or pneumatic systems, sold as a unit, pressure snubbers for dampening variations in fluid pressure measurements in the nature of devices for protecting pressure instruments against pneumatic fluctuations, surges, spikes and fluid hammer all in the nature of pressure controllers for controlling the pressure of liquid, semi-liquid, and gaseous substances in industrial processes, pressure transducers and transmitters that convert hydraulic or pneumatic pressure into analog electrical signals for monitoring and controlling hydraulic or pneumatic systems, air filter gauges in the nature of air quality measurement apparatus, namely, pressure and flow air filter switches all in the nature of flow switches for monitoring and controlling the flow of gases, air flow balancing instruments, namely, air hoods for balancing air flow in HVAC systems in the nature of measuring and control devices for air conditioning technology, not being parts of HVAC units, averaging air flow grids, namely, air flow sensors for measuring air flow in the nature of measuring devices for air conditioning technology, not being parts of air-conditioning installations, air flow indicators in the nature of pressure indicators, air flow alarms in the nature of alarm installations and alarms not being parts of machines, namely, alarm installations and alarms not being parts of machines, air flow switches in the nature of flow switches for monitoring and controlling the flow of gases, air quality measurement apparatus, namely, particle counters, air velocity monitoring and control apparatus, namely, automatic inlet control valves for reciprocating air compressors, air velocity meters, namely, flow meters, air velocity indicators, namely, pressure indicators, air velocity switches, namely, flow switches for monitoring and controlling the flow of gases and liquids, manometers, pitot tubes, alarm sensors, anemometers; sound alarms, electrical annunciators, aspirator bulbs for providing a pressure source and for taking air samples in the nature of air analysis apparatus, averaging flow sensors being pressure sensors, bar graph meters, namely, display devices for displaying measurement of physical parameters, in particular, pressure, flow, temperature for use in the field of environmental parameters, all in the nature of digital signage; hand tools, pneumatic valve actuators; hydraulic valve actuators, air hammers for discharging compressed air to prevent the accumulation of bulk material in pipes, chutes and containers; piston vibrators for preventing the accumulation of bulk material in pipes, chutes and containers in the nature of pipe clearing machines, electric vibrators for preventing the accumulation of bulk material in pipes, chutes and containers in the nature of pipe clearing machines, volume boosters for pneumatic control valves being parts of machines operated pneumatically, Metal manifolds for use with hydraulic and pneumatic systems; metal valves not being parts of machines; metal thermowells, Brackets of metal, mount brackets with metal, hole plugs of metal, nuts of metal, screws of metal, pipe caps of metal, junctions of metal for pipes, elbows of metal for pipes, pipework of metal, fasteners of metal, clips of metal for pipes, vice claws of metal, siphon of metal, nameplates of metal, O-rings of metal, small items of metal hardware