Best Test Jars for Homebrew Hydrometer Samples (2026)
Updated How we research
A test jar is the tall cylinder that holds a sample so your hydrometer can float freely and give a clean reading. Height is the first thing to check, because the jar has to be deep enough for the hydrometer to float without bottoming out or bumping the sides. Plastic jars shrug off drops and suit a busy bench, while glass gives a clearer view of the scale and resists scratching over time. A wide, stable base keeps the whole thing from tipping when you drop a sample in, which saves both your beer and your hydrometer. Any brewer using a hydrometer needs a test jar to go with it, since taking readings in the fermenter is awkward and risks contamination. It pairs directly with your hydrometer, and a size matched to that tool avoids the frustration of a float that will not settle. Choose plastic if you tend to knock things over and glass if you value a crisp view of the reading. Sanitize it like any other gear if you plan to return the sample, though many brewers simply taste the sample and pour it away.
The short version
We compared 7 picks. Our scores range from 6.5 to 8.2 out of 10.
- Best overall:Fermentaholics Hydrometer Test Jar, 250 ML. Highest overall score in this guide at 8.2/10.
- Also great value:Chicago Brew Werks Hydrometer Test Jar, 14 in. Value score of 8/10, overall 8.2/10.
- Solid build:Brewing America Glass Hydrometer Jar and Brush. Build and materials score of 8/10, overall 7.8/10.
- Feature-rich:HOBBYIN Hydrometer Test Jar, 250 ml. Features score of 7/10, overall 7.6/10.
Scores are our editorial assessment, not customer ratings. How we score
As an Amazon Associate we earn from qualifying purchases. This does not change our picks. Affiliate disclosure
Fermentaholics Hydrometer Test Jar, 250 ML
Fermentaholics hydrometer test jar and measuring cylinder with 250 ML capacity for gravity readings.
Chicago Brew Werks Hydrometer Test Jar, 14 in
Chicago Brew Werks 14" plastic hydrometer test jar, a tall sample jar for longer hydrometers.
- 1.Fermentaholics Hydrometer Test Jar, 250 ML8.2/10See on AmazonCheck price
- 2.Chicago Brew Werks Hydrometer Test Jar, 14 in8.2/10See on AmazonCheck price
- 3.Brewing America Glass Hydrometer Jar and Brush7.8/10See on AmazonCheck price
- 4.HOBBYIN Hydrometer Test Jar, 250 ml7.6/10See on AmazonCheck price
- 5.Hydrometer Test Tube for Homebrew, 100 ml7.2/10See on AmazonCheck price
- 6.Hydrometer Test Tube Graduated Cylinder, 100ml7.2/10See on AmazonCheck price
- 7.Glass Hydrometer Test Jar6.5/10See on AmazonCheck price
| # | Product | Our score | Price | |
|---|---|---|---|---|
| 1 | Fermentaholics Hydrometer Test Jar, 250 ML | 8.2/10 | See on Amazon | Check price |
| 2 | Chicago Brew Werks Hydrometer Test Jar, 14 in | 8.2/10 | See on Amazon | Check price |
| 3 | Brewing America Glass Hydrometer Jar and Brush | 7.8/10 | See on Amazon | Check price |
| 4 | HOBBYIN Hydrometer Test Jar, 250 ml | 7.6/10 | See on Amazon | Check price |
| 5 | Hydrometer Test Tube for Homebrew, 100 ml | 7.2/10 | See on Amazon | Check price |
| 6 | Hydrometer Test Tube Graduated Cylinder, 100ml | 7.2/10 | See on Amazon | Check price |
| 7 | Glass Hydrometer Test Jar | 6.5/10 | See on Amazon | Check price |
Fermentaholics hydrometer test jar and measuring cylinder with 250 ML capacity for gravity readings.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + 250 ML capacity floats most standard hydrometers
- + Doubles as a measuring cylinder for water and additions
- + Fermentaholics focuses on fermentation gear with clear markings
- - Check whether the test jar is glass or plastic before ordering
- - Tall narrow jar can tip over on uneven surfaces
Chicago Brew Werks 14" plastic hydrometer test jar, a tall sample jar for longer hydrometers.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + 14" height lets long hydrometers float without touching bottom
- + Plastic jar resists breaking during busy brew days
- + Tall shape gives accurate readings for high-gravity samples
- - Tall jar needs more sample liquid than short tubes
- - Plastic walls may scratch and blur the meniscus over time
Brewing America glass hydrometer test tube jar with a cylinder brush for cleaning after readings.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10
- + Glass jar stays clear and does not absorb odors
- + Cylinder brush included for scrubbing out sticky wort
- + Useful combo for brewers replacing a basic plastic tube
- - Glass can break if knocked off the counter
- - Check the jar volume and height before ordering
HOBBYIN 250 ML hydrometer test jar measuring cylinder, a basic sample jar for beer and wine gravity checks.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + 250 ML size fits typical triple scale hydrometers
- + Graduated markings help measure small liquid additions
- + Affordable replacement for a broken test jar
- - Lesser-known brand with limited detail on material thickness
- - Sample volume is fairly large, which wastes more wort per reading
A 100ml hydrometer test tube for homebrew beer and wine, a compact sample tube for smaller hydrometers.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + 100ml size uses less wort per gravity reading
- + Compact tube stores easily with the hydrometer
- + Good choice for small batch brewers who cannot spare much sample
- - May be too short for full size hydrometers to float freely
- - Narrow tube can let the hydrometer stick to the walls
A plastic graduated 100ml hydrometer test tube with clear scale markings for homebrew gravity samples.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + Plastic build will not shatter if knocked over
- + Clear scale markings double as a small measuring cylinder
- + Low sample volume conserves precious wort or mead
- - Short tube may not suit longer hydrometers
- - Plastic can scratch and cloud with repeated cleaning
A basic glass hydrometer test jar for holding wort or wine samples while taking gravity readings.
Fit for the job 7/10 · Features and specs 5/10 · Build and materials 7/10 · Value 7/10
- + Glass jar is easy to sanitize and keeps readings clear
- + Simple replacement for a broken or cloudy plastic tube
- + Heavy glass base is more stable than lightweight plastic
- - Check the jar size fits your hydrometer before ordering
- - Glass is fragile around hard floors and sinks
Before you buy: trade-offs we flagged
No pick is perfect. These are the main compromises we noted for the top products in this guide, so you can check they will not matter for you.
- Check whether the test jar is glass or plastic before ordering (Fermentaholics Hydrometer Test Jar, 250 ML)
- Tall jar needs more sample liquid than short tubes (Chicago Brew Werks Hydrometer Test Jar, 14 in)
- Glass can break if knocked off the counter (Brewing America Glass Hydrometer Jar and Brush)
- Lesser-known brand with limited detail on material thickness (HOBBYIN Hydrometer Test Jar, 250 ml)
- May be too short for full size hydrometers to float freely (Hydrometer Test Tube for Homebrew, 100 ml)
- Short tube may not suit longer hydrometers (Hydrometer Test Tube Graduated Cylinder, 100ml)
Frequently asked questions
›What is the best choice among test jars for homebrew hydrometer samples (2026)?
Fermentaholics Hydrometer Test Jar, 250 ML is our top overall pick. Fermentaholics hydrometer test jar and measuring cylinder with 250 ML capacity for gravity readings. It earns our score of 8.2/10, based on fit for the job, features, build and value.
›What is a good budget option?
Chicago Brew Werks Hydrometer Test Jar, 14 in is the strongest low-cost pick in this guide. Chicago Brew Werks 14" plastic hydrometer test jar, a tall sample jar for longer hydrometers.
›How much should I expect to spend?
Picks in this guide span See on Amazon price bands (roughly: $ = under $30, $$ = $30 to $100, $$$ = over $100). We never display exact prices because they change constantly, so the buttons above always show Amazon's current price.
›How were these products chosen?
We shortlist products that fit the job this guide solves and compare their published specifications, such as size, capacity, materials and what is included. Each pick gets an editorial score out of 10 for fit, features, build and value, and we write the pros and cons from those details. Our score is not an Amazon customer rating. We earn a commission if you buy through our links, which never affects the ranking.
Home Brew Craft independently selects every product; we may earn a commission from links above.
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