- Specific Gravity(S G) – most used by US/UK
- Oechsle Scale – named after Ferdinand Oechsle of Pforzheim, Germany
The hydrometer is winemaking’s most important instrument. To illustrate, in Germany, the entire legislation regarding winemaking is based on the hydrometer! And German winemaking legislation is the most stringent in the world.
Winemaking without a hydrometer is like driving a car without a steering wheel – there’s a strong chance of not getting to the destination. It is the only instrument necessary for the winemaker. Professional winemaking would be impossible without it.