Air analysis apparatus; Altimeters; Anemometers; Barometers; Distance measuring apparatus; Echo sounding devices; Electric, electronic, or electrochemical oxygen monitors and sensors for environmental use; Endoscopic equipment for industrial purposes; Flowmeters; Gas flow meters; Hygrometers; Meteorological instruments; Panel meters, namely, an electronic instrument that displays an input signal in either a digital or analog form; Speed indicators; Telemeters; Temperature indicators; Temperature sensors