Meteorological instruments; air analysis apparatus; scientific instruments, namely, electronic analyzers for measuring, testing and detecting contaminants and environmental pollutants; gas testing instruments; scientific instruments, namely, electronic analyzers for testing and analyzing chemical and biological substances for the presence, absence, or quantity of contaminants; optical inspection apparatus for industrial use; level gauges for contaminants

'absenc':39 'air':3 'analysi':4 'analyz':10,27,31 'apparatus':5,46 'biolog':34 'chemic':32 'contamin':16,43,53 'detect':15 'electron':9,26 'environment':18 'gas':20 'gaug':51 'industri':48 'inspect':45 'instrument':2,7,22,24 'level':50 'measur':12 'meteorolog':1 'name':8,25 'optic':44 'pollut':19 'presenc':38 'quantiti':41 'scientif':6,23 'substanc':35 'test':13,21,29 'use':49

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