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Photometers; Densitometers not for medical use; Electro-optical instruments for use in inspection and measurement of industrial components; Electronic ultrasound flaw detectors; Luminoflux meters; Metal hardness testing machines; Optical frequency metrology devices; Precision instruments for manipulation and positioning of microscopic objects; Screw-thread measuring machines and instruments; Surveying instruments; Tool measuring instruments; Ultrasonic thickness gauges; Vibration meters