Apparatus for testing gas, liquids and solids; Concentration meters; Illuminometers; Flowmeters; Refractometers; Thermometers, not for medical purposes; Liquid analyzers; Air analysis apparatus; Surveying instruments; Scientific instruments, namely, electronic analyzers for measuring, testing and detecting contaminants and environmental pollutants; Optical inspection apparatus; pH meters; Digital pH meters; Hygrometers

'air':20 'analysi':21 'analyz':19,29 'apparatus':1,22,41 'concentr':8 'contamin':35 'detect':34 'digit':44 'electron':28 'environment':37 'flowmet':11 'gas':4 'hygromet':47 'illuminomet':10 'inspect':40 'instrument':24,26 'liquid':5,18 'measur':31 'medic':16 'meter':9,43,46 'name':27 'optic':39 'ph':42,45 'pollut':38 'purpos':17 'refractomet':12 'scientif':25 'solid':7 'survey':23 'test':3,32 'thermomet':13

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