There are two types of hydrometers, the Specific Gravity Scale and the Oechsle Scale (named for Ferdinand Oechsle). Each has a different measurement scale.

Generally, people familiar with the measurement systems in the United States and the United Kingdom refer to the Specific Gravity Scale. Others may prefer the Oechsle Scale.

We have created two entire sets of instructions for these hydrometers.

Click HERE to go the the Specific Gravity Instructions.

Clic HERE to go the the Hydrometer with Oechslescale Instructions.