Graduated Plastic Test Jar
A good proof reading starts with the right vessel. This tall graduated test jar holds your sample so your hydrometer floats free and true.
We reach for ours on every single run. Pour off a little spirit, drop in the hydrometer, and read your proof without any guesswork.
- Tall shape made for floating a hydrometer
- Clear graduations for steady readings
- Lightweight and easy to clean
- Free U.S. shipping
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Good to know
A good proof reading starts with the right vessel, and this graduated plastic hydrometer test jar is the one we reach for on every single run. Its tall shape holds your sample so the hydrometer can float free and true, which means the number you read is the number you've got.
Why use a dedicated hydrometer test jar?
A hydrometer that touches the side or bottom of its container gives a false reading. A tall jar lets it settle freely, and the clear graduations show how much sample you've poured, so every test starts the same way.
- Simple routine: pour off a little spirit, lower in the hydrometer, give it a gentle spin, and read where the liquid meets the stem.
- Steady readings: stand the jar on a level surface and read at eye level so your results stay consistent from run to run.
- Lightweight and easy to clean: rinse it after each use and let it dry so leftover sample doesn't throw off the next test.
- Size question? If you want to be sure your hydrometer fits, contact us before you order.
Pair it with our proof and Tralle hydrometer and you have a small, reliable testing station. That's the scientist's side of the craft: measure, write it down, compare, improve. The more consistently you test, the more clearly you'll see how your heat and timing shape each run. Proof testing works the same for fuel alcohol and for spirits made under federal TTB permits.