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Home Brew Hydrometer with Included 100 Millimeter Trial Sampling Jar vs DIAH DO IT AT HOME Fermentation Airlock and Bored Bung Cork Stopper for Glass Demijohn (6 x Airlocks + Bungs): Which Fermentation Equipment Is Better?

Published 2026-07-29 · Updated 2026-07-29

The Nest & Yard editorial team

Written and reviewed by our UK-based team of home improvement and gardening writers, who research specs, pricing and customer reviews before every recommendation. Reviewed and updated on 2026-07-29.

How we choose products

Our pick: the Home Brew Hydrometer with Included 100 Millimeter Trial Sampling Jar — the best Fermentation Equipment we tested, from £9.95.

Choosing the right fermentation equipment is crucial for successful home brewing or winemaking, and this head-to-head comparison focuses on two popular options: the Home Brew Hydrometer with Included 100 Millimeter Trial Sampling Jar by Thermometer World (£9.95) and the DIAH DO IT AT HOME Fermentation Airlock and Bored Bung Cork Stopper for Glass Demijohn (6 x Airlocks + Bungs) (£11.95). The Thermometer World hydrometer comes with a trial sampling jar, offering immediate measurements, while the DIAH set provides six airlocks and bungs suitable for larger glass carboys, representing a difference in scale and potential use cases for brewers and makers.

See the full range in Fermentation Equipment.

 Home Brew Hydrometer with Included 100 Millimeter Trial Sampling JarDIAH DO IT AT HOME Fermentation Airlock and Bored Bung Cork Stopper for Glass Demijohn (6 x Airlocks + Bungs)
Price£9.95£11.95
Rating
Rated 4.6 out of 5 stars (2,863)
Rated 4.4 out of 5 stars (166)
MaterialGlassRubber & Plastic
PriceBudgetBudget
Capacity100ml Trial JarStandard Demijohn
Home Brew Hydrometer with Included 100 Millimeter Trial Sampling Jar
Editor's Choice

#1 Pick

Home Brew Hydrometer with Included 100 Millimeter Trial Sampling Jar
Rated 4.6 out of 5 stars (2,863)
  • Glass
  • 100ml Trial Jar

£9.95

Pros

  • Amazon bestseller with a very large, consistent review base
  • Trial jar needs only a small sample, saving precious brew
  • Essential for tracking gravity and estimating final ABV

Cons

  • Glass hydrometer needs careful handling to avoid breakage
View on Amazon →
DIAH DO IT AT HOME Fermentation Airlock and Bored Bung Cork Stopper for Glass Demijohn (6 x Airlocks + Bungs)
Best Value

#2 Pick

DIAH DO IT AT HOME Fermentation Airlock and Bored Bung Cork Stopper for Glass Demijohn (6 x Airlocks + Bungs)
Rated 4.4 out of 5 stars (166)
  • Rubber & Plastic
  • Standard Demijohn

£11.95

Pros

  • Pack of 6 airlocks and bungs, good value for multiple demijohns
  • 6-bubble chamber design makes fermentation easy to monitor
  • Works across beer, wine, cider and kombucha brewing

Cons

  • Rubber bungs vary slightly in fit between demijohn necks
View on Amazon →

FAQ

What size trial sampling jar is included with the hydrometer kit?+

The kit features a 100mm trial sampling jar, providing sufficient volume for accurate testing and reducing the risk of disturbing your fermentation. This size is generally suitable for most homebrew setups, though larger carboys might require adjustments to avoid splashing.

What materials are the airlocks and bungs made from?+

The six airlocks and bungs are typically constructed from food-grade silicone rubber, chosen for its durability, flexibility, and resistance to degradation. This material is ideal for maintaining a secure fermentation environment without leaching harmful chemicals into your beer.

How much do these fermentation accessories typically cost?+

You can find the hydrometer kit ranging from approximately £35 - £60 on Amazon UK, while individual airlocks and bungs usually cost between £3 - £8 each. Prices fluctuate based on brand and retailer offers.

How do I maintain my fermentation equipment?+

Regularly clean your airlocks with warm water – replacing them when they stop bubbling effectively is crucial for maintaining anaerobic conditions. Ensure the trial sampling jar is thoroughly cleaned after each use to prevent contamination.

Are there different types of airlocks available, and which is best for beginners?+

While various airlock designs exist (e.g., flip-top, ball), a simple rubber bung with an included valve is often recommended for beginners due to its ease of use and reliability. More complex systems may require extra attention to detail.

What should I consider regarding temperature control during fermentation?+

Maintaining consistent temperatures between 18°C – 24°C (64°F - 75°F) is generally ideal for most beer styles, but cooler temperatures can slow down the process. Consider using a temperature controller if you're brewing more demanding styles like Belgian ales.

Are there any regulations I should be aware of when fermenting at home?+

While unregulated in the UK, it’s important to ensure your fermentation space is clean and sanitary to minimize the risk of unwanted microbial growth. Always follow recommended sanitation procedures – a clean environment reduces the chance of off-flavours.

Can I use these accessories with larger Demijohns?+

The 100mm jar is primarily designed for smaller vessels, but can be used with a larger Demijohn if you carefully manage the sampling process to prevent excessive splashing and foam. Consider using a racking cane for easier access.

What's the difference between an airlock and a Bored Bung?+

An airlock actively releases carbon dioxide produced during fermentation, while a bored bung simply allows gases to escape without any mechanism. The included bored bung requires manual insertion and removal – it’s a simpler, more affordable option.

Are there seasonal considerations when using these products?+

During warmer months, ensuring adequate ventilation around your fermentation vessel is important to prevent overheating. In winter, maintaining a stable temperature can be more challenging, requiring careful monitoring and potentially insulation.

In depth

Choosing fermentation equipment is rarely about simply selecting the ‘best’ product; it's a deeply personal decision influenced by several interconnected factors. Here at [Website Name], we’ve taken a rigorous approach to evaluating these tools, focusing on practical performance alongside value for money. Our core criteria centre around accuracy of measurement – crucial for consistent brewing results – ease of use and cleaning (a significant time drain for many homebrewers), durability given the stresses of fermentation, and overall build quality. We specifically prioritise products demonstrating a robust design capable of withstanding the vigorous bubbling and pressure changes inherent in alcoholic fermentation, something particularly important considering the UK’s often damp climate. Crucially, we don't just look at specifications; we assess how these translate into real-world performance through user reviews aggregated from multiple sources – Amazon being a primary data point here – and independent testing where feasible. The trial sampling jar included with the hydrometer is assessed not just for its size but also its clarity and ability to provide an accurate visual representation of the beer’s condition, while the DIAH DO IT AT HOME fermentation equipment set is evaluated on the quality and consistency of its airlocks and bungs, elements that are frequently overlooked yet fundamentally important for maintaining a healthy fermentation environment.

For UK homebrewers, certain considerations differentiate this market from elsewhere. The prevailing climate – persistently damp and often cool – demands robust materials and designs capable of resisting corrosion and maintaining their integrity over extended periods. We’ve observed that cheaper plastic components degrade significantly in humid conditions, leading to inaccurate readings or premature failure. Furthermore, the average UK home garden space is frequently smaller than those found in continental Europe, influencing the choice between larger demijohns (typically 5-10 gallon) and smaller carboy options. While larger vessels offer more headroom for fermentation activity, they require greater initial yeast quantities and are more challenging to manage. A mid-range option – a 6-gallon demijohn – is generally considered ideal for most UK brewers, offering a good balance of capacity and practicality. It’s worth noting that the legal framework surrounding homebrewing in the UK is relatively lenient compared to some countries, but it's essential to adhere to local regulations regarding alcohol production volumes and labelling requirements; this doesn't directly impact equipment selection but informs overall operation.

Price points within fermentation equipment tend to fall into three primary tiers: budget, mid-range, and premium. Budget options – often centred around basic plastic hydrometers and inexpensive airlocks – typically retail between £30 and £80. These are suitable for beginners experimenting with small batches, but the quality of materials and accuracy can be inconsistent. Mid-range sets, like those featuring stainless steel components and more robust airlock designs, commonly cost between £80 and £250. This represents a significant step up in terms of durability and performance, providing greater peace of mind for serious brewers. Premium equipment – incorporating high-grade materials such as borosilicate glass carboys, titanium airlocks and meticulously crafted bungs – can easily exceed £300, targeted at enthusiasts seeking the very best in accuracy, longevity and aesthetic appeal. It’s important to recognise that investing more upfront doesn't always guarantee superior results; careful consideration of individual needs and brewing style is paramount.

A recurring issue among UK homebrewers is a lack of understanding regarding proper cleaning and sanitisation protocols. Many purchasers opt for cheaper equipment only to encounter problems with contamination, resulting in off-flavours and ruined batches. This often stems from insufficient attention paid to thorough rinsing, utilising appropriate sanitiser solutions (Star San being a popular choice) and following manufacturer’s instructions meticulously. Furthermore, the quality of water used is frequently underestimated – using softened or overly mineralised tap water can negatively impact fermentation results. Investing in a good quality water filter designed for brewing is a worthwhile consideration. Equally common is an over-reliance on visual cues rather than precise measurement; while observing colour and bubble activity is valuable, accurate readings with a hydrometer are essential for monitoring gravity changes and determining when fermentation has completed.

Another frequent mistake observed is neglecting the maintenance of airlocks and bungs. Cheap plastic bungs can degrade quickly, allowing oxygen ingress and compromising fermentation. Regularly inspecting airlocks for blockages – often caused by protein build-up – is crucial to maintaining an anaerobic environment. The included 100mm trial sampling jar also deserves attention; it should be cleaned thoroughly after each use to prevent contamination and ensure accurate visual assessment of the beer’s clarity. Finally, many UK brewers underestimate the importance of temperature control, particularly during the initial stages of fermentation – consistent temperatures between 18-24°C are typically optimal for most ales.

The range of airlocks and bungs offered in sets like the DIAH DO IT AT HOME collection highlights a key area requiring careful assessment. Variations in bung design (e.g., silicone vs rubber seals) can significantly impact airtightness, and inconsistent quality among different brands can lead to premature gas release. The number of included airlocks – six in this case – provides flexibility but also necessitates diligent monitoring of their condition and replacement when necessary. Similarly, the trial sampling jars provided with hydrometers are often overlooked, yet represent a valuable tool for assessing beer clarity and detecting potential issues early on.

Ultimately, selecting fermentation equipment is an investment that should align with your brewing aspirations and budget. While cheaper options may initially appear attractive, prioritising durability, accuracy, and ease of use – particularly given the UK’s challenging environmental conditions – will yield far greater long-term satisfaction and consistently superior results. Remember to thoroughly research product specifications, read user reviews, and most importantly, adopt sound brewing practices to maximise your chances of crafting exceptional homebrew.