Air analysis apparatus; Depth gauges; Gas testing instruments; Infrared thermometers, not for medical purposes; Optical inspection apparatus; Precision instruments for manipulation and positioning of microscopic objects; Surveying instruments; Tool measuring instruments

'air':1 'analysi':2 'apparatus':3,17 'depth':4 'gas':6 'gaug':5 'infrar':9 'inspect':16 'instrument':8,19,28,31 'manipul':21 'measur':30 'medic':13 'microscop':25 'object':26 'optic':15 'posit':23 'precis':18 'purpos':14 'survey':27 'test':7 'thermomet':10 'tool':29

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