This hydrometer is 230mm long and has one duplicate scale: ¥ Specific Gravity 0.970Ð1.150 at 20¡C (68¡F), The duplicate scale and clear large figuring means that the hydrometer is easily read from any angle. The wide measurement range makes this hydrometer suitable for use with kits designed to produce high strength products. The hydrometer comes packed in a strong clear plastic tube which doubles as a sample jar. It can also be supplied with a base that can be used to help hold the jar steady. It has a detailed instruction leaflet which includes a temperature correction table, tables for converting specific gravity readings to sugar and potential alcohol scales, and instructions on how to calculate actual % alcohol from the hydrometer readings.