9 Scientific, surveying, optical, weighing, measuring, monitoring, signalling and checking, and supervision apparatus and instruments, namely, particle counters, alarm monitoring systems, alarm sensors, alarms for the detection of inflammable gases, automatic fluid-composition control machines and instruments, automatic inlet control valves for reciprocating air compressors, automatic liquid-flow control machines and instruments, automatic liquid-level control machines and instruments, automatic pressure control machines and instruments, concentration meters, control valves for regulating the flow of gases and liquids, electric control panels, electric meters, electronic apparatus for the remote control of industrial operations, electronic valves for controlling gas or fluids, fiber optics, fiber optic couplings, flow meters, gas alarms, optical inspection apparatus, weighing machines, flow cytometers and flow-based analyzers providing cell and particle analysis, detection, or counting for scientific, laboratory, and general research; gas and air analysis apparatus; apparatus and instruments for physics and instruments for measuring the physical properties of gases, namely, measuring apparatus for measuring concentrations of gases, measuring apparatus for measuring particles in gases, measuring apparatus for measuring air quality, measuring apparatus for measuring contaminants and environmental pollutants in gases and measuring apparatus for measuring humidity, temperature, pressure, quantity, concentration and viscosity of gases; detectors for detecting the presence or the proportion of a gas in a gas mixture; gas alarms; analysis and diagnostic apparatus, not for medical purposes, for testing gas; apparatus for recording, transmission, accumulation, processing and reproduction of images and data; calculating machines, computers; computer software for measuring gas and air particles for use with gas and air analysis apparatus