9 Computer hardware; Downloadable computer software for online/offline gases measurement, data collecting, data analysis and data management in all circumstances; Chromatography apparatus for laboratory use; Gas chromatographic analyzer; Laboratory instruments; Analysis and testing instruments; Recycling system testing instrument; Recovery of voltage-stabilized testing instruments (including Temperature indicators, Manometers, Vacuum gauge, Densitometers, Manometer, Level gauge, Densimeters, Acid hydrometers, Pressure indicators, Analysis Spectrometer, Spectrum analyzer, Analog network analyzer, Synthetic network analyzer, Photometers, Fluorometer, Fluorescent spectrometer, Gas leak detector, Gas flow indicator, Liquid level gauge, Automatic turbidimeter, Oxygen concentration meter, Exhaust meter, Oxygen detector, Viscosimeters, Dissolved oxygen meter, PH value testing probe, Maximum oxygen uptake meter, Detector for gas in transformer insulating oil, Thermo-hygrometers, Hygrometers, Flowmeter, Concentration meter, and UV intensity meter)