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How to Select the Right Hydrometer

How to Choose the Right Hydrometer

If you have been homebrewing for any amount of time, you already know to expect the unexpected. You might get your hands on a bad batch of yeast and your beer does not ferment. Or your yeast might ferment so quickly you worry it did not ferment at all.

This is where your hydrometer can save the day and an often overlooked step in brewing, even though it is quick and painless. Get in the habit of using it during every batch to determine if your fermentation has finished, maintain consistent results, and measure your estimated alcohol by volume (ABV).

Although you could run into occasions where a batch cannot be saved, you can record your mistakes and make sure they are not repeated next time. Or, in the case of your ABV being far higher than expected, you can make smaller pours or move to a session beer after your first glass.

Look at some available hydrometers. The three types described below are suitable for up to 22 percent ABV, so they are useful for beer, mead, cider, and wine.

Triple Scale Hydrometer
This is the most commonly used hydrometer, and the least expensive. It is also multi functional, and measures specific gravity, Brix/Balling scale, and potential alcohol. This type of hydrometer measures a wider range of specific gravity (0.00 to 1.170) so one size fits most batches. However, this also means that your readings could be off a little bit, because the device can measure a larger range of numbers.

The thermohydrometer measures specific gravity and temperature. Thermometer calibrations can vary by device, so you risk inaccurate readings if you are not using the same one each time you test. But having the thermometer built in ensures your temperature is consistent.

Regular Hydrometer
The regular hydrometer measures specific gravity, and numbers are spaced on a smaller scale, which means you can get a more accurate reading. However, you may have to buy two hydrometers, depending on what you are brewing. Regular Hydrometers measure 0.00 to 1.170.

Things to Consider
Glass breaks, especially when you are dealing with wet hands and lots of moving parts. Many hydrometers come with a testing jar at no extra cost that does double duty as a case, but the cylinders are thin plastic with strength that is comparable to a Solo cup. Do your homework when shopping online, while some hydrometers clearly come with the testing jar, some retailers do not make that as obvious. If it fits your budget, buy a testing jar that has a wide base and a cuff around the top that does not allow the jar to tip all the way sideways. Store your hydrometer in a sturdy case so to avoid any unpleasant surprises on brew day. Perhaps you will feel better having two hydrometers on hand so you will always have a backup.

Another hydrometer you might come across, the proof & tralle hydrometer, is designed for much higher ABV solutions, like spirits and liquors. It is not suitable for beers, wines, and meads. Before you take a reading test your hydrometer with distilled water (minerals frequently found in tap water can skew your results) before you test your beer. You will know if your readings are accurate or if you need to either adjust your equations or swap it for a new one. Many manufacturers use a paper scale inside the glass, which can slip around and result in inaccurate readings, so be sure you are using one with a plastic insert. A hydrometer is a useful tool that will save you many headaches and many batches down the road. Incorporate it into your process, and your batches will only continue to get better and more consistent with time.