Designed to accept observation tube up to 220 mm length its improved rotating half shadow system at the front ensures perfect focus and clear definition. With angular glass scale 0-360°, divided into degrees and reading up to 0.05° with micrometer. A sugar scale from 30° to 120° reads up to 0.1 sugar degree. Supplied complete with two polarimeter tubes 100 mm and 200 mm, and dust cover.