[ Scientific and laboratory apparatus, instruments and equipment, namely, rotors, counter-balance weights, centrifuges, glass sinters, spin filters, spin filter holders, columns, adaptors, flow restrictors, tubing, vacuum pumps, manifolds, pumps, valves for use in centrifugation and filtration; devices, instruments and equipment for measurement and quantification of chemical, biochemical and biological components of liquid or gaseous materials, namely, spectrophotometers, devices and instrume...