SH108C Automatic TAN/TBN TesterASTM D664 Potentiometric Titration Micro‑computer Total Acid Number Tester for Precise Acid Value MeasurementThe SH108C Automatic TAN/TBN Tester is strictly developed in compliance with relevant national standards. The unit consists of three main modules: hardware circuit, titration assembly and microcomputer control system. Supported by dedicated application software, it implements potentiometric titration to determine sample acid‑base content