Fermentaholics Hydrometer Test Jar & Measuring Cylinder 250 ML Review (2026)

Size and capacity

This test jar holds 250 mL of sample liquid, sized to comfortably float most standard homebrew hydrometers used for measuring specific gravity in beer, wine, mead, cider and other fermented beverages. A 250 mL capacity sits in the middle of the range for test jars, large enough to give an accurate reading without wasting a large volume of the batch on a single gravity check. Because the jar is also marked as a measuring cylinder, it can pull double duty for measuring small volumes of water or other additions during a brew day rather than sitting unused between gravity readings.

Stability and pouring

A hexagonal base is the jar's main design choice for stability, giving it flat sides that resist rolling or tipping over on a counter the way a fully round cylinder can, which matters when a hydrometer is floating inside and a knock could send both the jar and the glass hydrometer to the floor. An easy pour spout molded into the rim is meant to make returning the tested sample back into the fermenter or down the drain cleaner, without liquid running down the outside of the jar. Together these two features are aimed at the two moments a test jar is most likely to cause a mess, setting it down and pouring it out.

Readability and markings

The jar's graduation markings are printed in blue on one side and raised in the plastic on the other side, a combination meant to keep the scale legible even after the jar has been washed, scrubbed and handled for years. Having both a printed and a raised scale is useful because printed ink can fade or wear off a plastic surface over repeated cleanings, while the raised lines stay readable by touch or under low kitchen lighting even once the ink has faded. This dual approach to marking is a small but practical detail for a tool that gets used every time a brewer wants to check where fermentation stands.

Durability and heat resistance

Fermentaholics lists the jar as heat resistant up to 121 degrees Celsius, well above the temperature of any liquid a homebrewer would normally pour into a test jar, which gives some margin of safety if a sample is drawn while still warm from the kettle or mash tun. Being industrial strength plastic rather than glass also means the jar can handle an accidental drop or bump on a counter without the shattering risk that comes with an all-glass test jar, which is a real advantage in a kitchen or garage brewery where surfaces are often cluttered and a spare hand is not always free.

Who should buy it

This test jar suits homebrewers who want a stable, easy to pour sample jar for routine hydrometer checks across beer, wine, mead and cider batches, especially anyone who has previously dealt with a glass jar tipping over or cracking. Its 250 mL size fits comfortably with most standard hydrometers without needing a large sample pulled from the fermenter. It is a less ideal match for anyone who specifically wants a tall, narrow test tube style jar for very long hydrometers, since a hexagonal cylinder design trades some height for a wider, more stable footprint.

Frequently asked questions