9 Apparatus and instruments for industrial and scientific purposes, namely, analysers, measuring, controlling and regulating apparatus and instruments for testing waste water and drinking water; measuring and recording apparatus for scientific testing purposes and for waste water and drinking water analysis; electric measuring and testing apparatus, in particular photometers, spectral photometers, colour-measuring apparatus, brightness and reflection measuring apparatus, transparency and turbidity measuring apparatus instruments for testing waste water and drinking water; waste water and drinking water analysers; downloadable operating software for the aforesaid apparatus and instruments; Groundwater sampling equipment, namely, testing sticks, sample containers, and automated sample pumps