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TAN and TBN Tester | Labotronics Labotronics TAN and TBN automatic tester with computer operator unit and dual determination mode. It has 2 channel of titration module. In potentiometric method titrant is added to the oil sample to neutralize ,through it determine amount of acid or base needed to neutralize the oil. In polarization current method oil is mixed with a titrant (either an acid or a base) and this reactions generate electric current which determined amount of acid or base needed to generate current. Featured with multiple self-checking function and storage of data.