Profile: Rank Brothers Ltd. specializes in scientific instrument manufacturing and precision machining. Our product range includes oxygen electrodes, novel permeability tester, magnetic stirrers, photometric dispersion analyzer, micro-electrophoresis apparatus, polyelectrolytic titrator, and agrochemical emulsion stability tester. We develop and evolve a comprehensive range of equipment & accessories for oxygen measurement. Oxygen measurement controllers provide different levels of sophistication in the measurement of oxygen. The Model 300 magnetic stirrer is a motorless stirrer operated by generating a rotating electromagnetic field in the stirring heads.