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