B20 1 They measure the z-potential of surfaces. A special designed instrument, specialized for the research of interaction between solid surfaces and liquids that are coming in contact with. From this we gain precious conclusions for the chemical stability, chemical properties and the  combatibility between different materials. It has an integrated titrator-pH meter for the investigation of the influence of ionic strength on z-potential. Ideal for the research and development of new materials like nanomaterials, polymers, osmosis membranes, synthetic tissues, cosmetics, etc.