9 Measuring devices, electric; flowmeters; mass flow meters; flow control installations [electric]; quantity indicators; measuring, counting, alignment and calibrating instruments; measuring instruments; digital panel meters; controllers (regulators); monitoring instruments; electricity indicators; automatic dosage apparatus; measuring, detecting and monitoring instruments, indicators and controllers; testing and quality control devices; sensors and detectors; dosage dispensers; testing apparatus not for medical purposes; petrol gauges; chemistry apparatus and instruments; densimeters; detectors; diagnostic apparatus, not for medical purposes; regulating apparatus, electric; electric apparatus for commutation; monitoring apparatus, electric; frequency meters; apparatus for analysing gases; gasometers [measuring instruments]; hydrometers; hygrometers; fuel gauges; measuring apparatus; apparatus and instruments for physics; precision measuring apparatus; acid hydrometers; viscosimeters; distribution boards [electricity]