This document describes an automatic polarimeter device used to measure the optical rotation of organic substances. It can measure properties like specific gravity, purity, concentration, and content of active materials in substances like sugar solutions, turpentine oil, and camphor. The polarimeter uses polarizing filters and a quartz disc to produce a divided field of view for measurements. It has a measuring range of -45° to +45° and can achieve high accuracy and reproducibility. The device is powered by sodium vapor or mercury lamps and can be used in industries like oil, food processing, chemistry, and more.