Apparatus for measurement and electrotechnical and electronic apparatus for checking water, namely, titration apparatus, biological oxygen demand meters, heaters for sample softening in optical and color measurement apparatus, turbidity meters, flocculation and sedimentation meters, chemical oxygen demand meters, redox meters, pH-value meters, thermometers, oxygen saturation and concentration meters, salinity meters, chlorine meters, and water hardness meters, color comparators, spectrophotom...

polymer membranes and support structures for converting industrial wastes into chemical products