9 Measuring and Control Instruments for Electro-Chemical Measurements and Electrodes, pH-Meters, Automatic Titration Units-Namely, Recorders and Printers and Accessories Therefore Comprising Stands, Clamps, Plug-and-Cable Combinations, Immersion and Flowthrough Apparatuses of Glass, Metal and Plastic for Determination of Measured Values, Buffers, Electrolyte and Calibrating Units for Chemical, Physical, Medical and Technical Purposes; Viscosity Determination Instruments and Capillary Viscometers, Constant Temperature Baths, Precision Glass Tubes and Ground Rods for Scientific and Industrial Uses