Observing systems and instruments, namely thermometers, barometers, altimeters, wind velocity gages, humidity gages and combinations thereof, for sensing, measuring and monitoring air temperature, variations in air temperature, barometric pressure, variations in barometric pressure, humidity, changes in humidity, density, changes in density, altitude, and changes in altitude

'air':22,26 'altimet':8 'altitud':42,46 'baromet':7 'barometr':28,32 'chang':35,39,44 'combin':15 'densiti':38,41 'gage':11,13 'humid':12,34,37 'instrument':4 'measur':19 'monitor':21 'name':5 'observ':1 'pressur':29,33 'sens':18 'system':2 'temperatur':23,27 'thereof':16 'thermomet':6 'variat':24,30 'veloc':10 'wind':9

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