This hydrometer provides 2 scales of measurement which are Proof (the US International Revenue Scale for proof of spirits) and Tralles (the actual percentage of alcohol). It is calibrated to give accurate readings at 60°F (15.6°C) and includes a chart that provides the adjustments needed when using it at different temperatures. Generally used for taking readings in wine
or spirits.
11" Long with Proof (0-200), Tralle (0-100) scales.
