Homebrew Hydrometer for Beer, Wine & Cider

A simple glass homebrew hydrometer for measuring the specific gravity of beer, wine and cider. Take a reading before fermentation begins, then compare it with the final stable reading to follow fermentation and estimate the alcohol content of your finished brew.

Why Use a Homebrew Hydrometer?

• Record the original gravity (OG) before adding yeast.
• Track changes in specific gravity during fermentation.
• Check that the final gravity (FG) is stable before bottling or kegging.
• Estimate alcohol by volume using the original and final readings.

Important: A hydrometer measures specific gravity; it does not directly measure the alcohol percentage in a finished drink. Airlock activity alone also cannot confirm that fermentation is complete.

How to Take a Hydrometer Reading

1. Clean and sanitise the hydrometer, trial jar and sampling equipment.
2. Fill the trial jar with enough beer, wine or cider for the hydrometer to float freely.
3. Lower the hydrometer carefully and give it a gentle spin to release any clinging bubbles.
4. Once settled, read the specific-gravity scale at eye level at the bottom of the liquid's meniscus.
5. Record the reading. Before bottling, repeat the test over the interval recommended by your recipe or kit and only proceed when the readings are stable.

For more help, read our step-by-step hydrometer guide or enter your readings into our hydrometer and ABV calculator.

Please note: This is a fragile glass instrument and should be handled and stored carefully.