Scientific analytical instruments, namely, high vacuum chambers; interface device between a mass-spectrometer and a gas chromatograph; Glass tubes for scientific purposes, namely, polymer coated flexible glass tubing for inert flowlines; a range of liquid chromatography columns and parts thereof used to separate compounds; scientific instruments for determining total organic carbon in aqueous solutions; mass spectrometry apparatus; electron multipliers; stainless steel ferrule for use in separation sciences for gas chromatography; scientific and chromatography equipment, namely, gas chromatography apparatus for laboratory and industrial use; cylinder made from glass, namely, calibrated glassware used in separation sciences for gas chromatography specifically for injection sample introduction; scientific and chromatography equipment, namely, gas chromatography apparatus for laboratory and industrial use; chromatographic apparatus for scientific or laboratory use; chromatographic columns for scientific and laboratory use; chromatography sampling apparatus, namely, an analytical syringe used in separation sciences for chromatography and for laboratory and industrial use; diagnostic apparatus for scientific use, namely, diagnostic apparatus for the detection of pathogens for research and laboratory use; gas chromatography apparatus for scientific use; liquid chromatography apparatus for scientific use; scientific apparatus for diagnostic testing for biological samples, not for medical purposes; Disposable reusable auto-sampler dispenser syringes for laboratory use; interface device for automatically changing dispensing devices and analytical syringes on a robotic operating system; scientific and measuring equipment being precision syringes; precision syringes incorporating a digital drive measuring unit for laboratory use; digital regulating apparatus for regulating the flow of gases and liquids; digital measuring instruments for measuring temperature, quantity and concentration of liquids; digital liquid analyzers; digital drive unit coupled to a precision syringe for regulating the flow of gases and liquids; digital dispensers that count or measure volumetric output for use with gases and liquids