Aerometers; air analysis apparatus; gasometers; measuring instruments for measuring radiation, temperatures, humidity, magnetic fields, speed, laser, air quality, audio signals, force, nanometrology; precision measuring apparatus for radiation, temperatures, humidity, magnetic fields, speed, laser, air quality, audio signals, force, nanometrology; pressure measuring apparatus, namely, high pressure manometers, pressure gauges, pressure indicators, pressure recorders, pressure sensors, pressure transmitters