Eureka Mignon Libra 65 All Purpose in the Test

The Eureka Mignon Libra 65 All Purpose combines an integrated scale ("Grind-by-Weight") with 65-mm burrs for the first time at Eureka – an exciting concept for home baristas. It promises consistently accurate dosing at the push of a button and is designed to master both espresso and filter coffee. We tested the grinder intensively over several weeks in everyday use – in our home kitchen, in our coffee school, and in the lab. Our focus was on build quality and design, retention, grind quality in the cup, and operation and special features. In the end, you'll know whether the Libra 65 All Purpose is the right grinder for you at home.

Design

The Eureka Mignon Libra 65 All Purpose presents itself in the familiar compact Mignon design – an angular cube with approximately 39 cm height, 12.4 cm width, and 19.2 cm depth. The integrated scale on the front distinguishes it from the many other Eureka Mignon grinders.

Below the chute is a stable platform or fork where the portafilter or an included metal dosing cup can be placed. Our test unit in Ferrari red had a straightforward elegance; alternatively, Eureka also offers white, gray, black, and special colors (chrome, dark blue). The clear touch display on the front shows the target weight in grams and fits discreetly into the design. Overall, the Libra is a Mignon, or rather an Eureka, like the many other models from the manufacturer. Unmistakably a Eureka, a bit monotonous, but always recognizable as such. If you don't know about it, the weighing mechanism isn't noticeable.

Build Quality

The build quality of the Libra 65 All Purpose impresses in the test. The housing is largely made of metal (aluminum die-cast) and feels robust and high-quality. All parts fit precisely; nothing wobbles or rattles. At 6.5 kg, the grinder has solid stability – important so it doesn't shift during grinding.

The bean hopper holds about 350 g and sits firmly in its holder. Striking is the new large grind setting dial on the top: it's made of aluminum, offers good grip, and turns smoothly. Eureka has made a big leap here – earlier Mignon models had a tiny, fiddly dial that many users found annoying. Now we have a "king-size" dial with a scale that even counts rotations. This patented solution allows for very precise adjustments and later returning exactly to the starting point – ideal for switching between brewing methods without losing your place. Overall, the build quality of the Libra 65 makes a high-end impression, as you'd expect in this price range (~700–800 € depending on version).

Recommended Specialist Retailers

We search for specialist partners whose good work and service we know firsthand. We're in close contact with these retailers. These are affiliate links. If you order through this link, it doesn't cost you more, but we get a small commission that we invest in new test equipment. We're continuing to seek competent partners for you in the DACH region.

• Germany [affiliate link]: Stoll Espresso
• Austria [affiliate link]: Die Röster
• Switzerland [affiliate link]: deon
  

retention

On the subject of retention, the Libra 65 All Purpose scores with improvements over the previous model. Eureka has made the grinding chamber smaller and now screws the upper burr "blindly" from behind – this eliminates visible screws in the grinding area where coffee grounds could accumulate. In our test, we measured a total retention of approximately 2.1 g, of which about 1.5 g are temporary. Temporary means: with each grind, about 1.5 g of old coffee is replaced by fresh, while the rest (about 0.5–0.6 g) remains as permanent retention in corners. This value is very good for a hopper grinder. For comparison: many classic espresso grinders have 3 g or more retention. Thanks to the clever design, Eureka has actually reduced the retention value below that of its predecessor despite larger burrs – a welcome development.

Nevertheless, you shouldn't forget that a scale grinder always works with a full grinding chamber. So if you pull one espresso a day and want to pull one the next day, the first shot inevitably contains a small proportion of old coffee in the puck (the mentioned ~0.6 g). In practice, this is barely noticeable, but for very sensitive palates it can cost a touch of freshness. If you want every gram to be fresh, a single-dosing grinder would be a better choice. For normal home use, however, the retention of the Libra is not a problem – quite the opposite, in everyday use you notice positively that Eureka has worked on this.

Grind Quality

What matters in the end is what lands in the cup – and here the Libra 65 pleasantly surprised us. The new 65-mm flat burrs are designed as "All Purpose". A narrow main peak (142 µm!) contrasts with a relatively low proportion of fines of 27–28 %. The narrow main peak contributes to clear and complex cups, while the fine particles are particularly important for espresso preparation to build up enough resistance in the portafilter.

Our goal: espresso with enough body and clearly defined filter coffees – without overextraction from fines. In practice, this balancing act works well. The challenges, as often, lie in the details – and are also influenced by coffee selection.

Want to learn more about what particle distribution means and what the two curves shown above represent? Then the article on particle distributions provides the explanation.

Espresso

In our blind tastings, we brewed excellent espressos. However, the brewing behavior differs significantly from more classic espresso burrs with higher fines content and a slightly wider main peak. Due to the lower proportion of fines, the grind size for espresso preparation needs to be fine. The x50 isn't noticeably low, yet the extraction behaves as you'd expect from burrs with a very low x50.

So it initially takes 10 to 12 seconds before the first drops run from the portafilter. After that, the flow increases quickly, but the total flow time remains short. Sometimes the espresso flowed for only 12 to 16 seconds – with very good results.

This brewing behavior makes even and very clean puck preparation absolutely necessary. This is easier with darker roasts. We pulled strong, sweet shots with full body and yet clear aromatics. Light roasts showed surprising complexity – with slight loss of creaminess and body.

A note on consistency: After dialing in, we could repeatedly return to the exact same grind setting – and achieved very reproducible results. The particle size distribution showed only minimal deviations in the main peak when switching between settings – a difference of just ~6 µm! This speaks to the precision of the grind adjustment and the stability of the grinding mechanism.

Filter Coffee

All Purpose or Jack of All Trades?

However, our test also showed the limits of the all-rounder concept: the Libra 65 can handle espresso and filter – but not in alternating sequences. Once you've set it for espresso and want to spontaneously brew a cup of filter coffee, you need to adjust the grind significantly, sacrifice a few grams, and retare the scale. Switching "on the fly" is impractical in reality.

In that sense, the All Purpose capability isn't designed for spontaneous flexibility. The grinder can handle espresso and filter coffee, but it probably makes sense to commit to one main use case. You'll only occasionally switch to the other style in everyday life. For frequent switching, a single-dosing grinder – perhaps also with All Purpose burrs – would be the better choice.

Operation

In terms of operation, the Libra 65 proves to be mostly delightfully straightforward, though it has a few quirks and issues. First the positives: the touch display responds quickly and intuitively. You can conveniently switch between two storable amounts (e.g., single and double) or grind manually. The display of the target amount in 0.1 g increments is clear and readable. A particularly big plus is that changes to the grind setting don't affect the amount dispensed – the scale dynamically compensates and repeats the amount output. For anyone new to the espresso hobby, this is a blessing: you can freely adjust the grind, and still get e.g., 18.0 g into the portafilter. With timer-controlled grinders, you need to re-adjust the time after every grind change or manually reweigh, which complicates the adjustment process. Coarser grind results in more coffee, finer grind results in less. The Libra takes this concern away – it's really fun and makes experimenting easier.

The new grind setting dial also contributes to good usability. Due to its size and the built-in rotation counter, we can adjust very sensitively. In the test, for example, after pulling espresso, we adjusted the grind to coarse for filter and later turned it back exactly to the espresso mark – the next shots were actually nearly identical to the original extraction. This reproducibility impressed us. With some grinders, it takes courage and confidence to leave the once-found "sweet spot", fearing you'll never find it again – with the Libra 65, this problem is essentially solved.

Dosing Accuracy

Of course, we also checked how precisely the integrated scale really doses. Our experience: after properly performed calibration, the scale is very reliable. Over many pulls, the dispensed amounts fluctuated by ±0.1 g around the target value, sometimes hitting it to the tenth of a gram exactly. However, the grinder doesn't achieve this accuracy immediately in every situation. We observed that it "learns" with a new coffee for the first 2–3 pulls: the first shots with a freshly filled bean were about 0.5 g off target (e.g., 17.5 g instead of 18 g). After a few runs, the system settled in and consistently hit the target. Eureka apparently uses some kind of adaptive algorithm that corrects the flow – this takes a moment. Important: if you start every day with an empty hopper and pre-weighed beans (as with single dosing), the scale doesn't work optimally. The Libra is designed to operate with a constantly filled bean hopper – only then can it "learn" and really stop precisely. In normal use (one coffee type in the hopper over an extended period), we had no problems whatsoever and could fully rely on the set gram amount.

Unfortunately, there was also a small but regarding operation: in the test, it occasionally happened that the scale showed an error message. The display blinked "FH", and the grinder refused to start. This behavior occurred particularly when the portafilter remained on the holder too long before we started grinding – presumably a taring issue. The solution was simple but annoying: briefly remove the portafilter, wait a few seconds, and reinsert it, then everything worked again. This phenomenon occurred rarely, but often enough to be noticeable and irritating. Here's a note to Eureka: improve via firmware update if possible. This behavior made the scale seem a bit temperamental occasionally. All things considered, we rate usability positively – with some routine (and knowing the quirks), you get along well. Most of the time, you enjoy simply hanging the portafilter and pressing "Start" without giving it further thought.

Finally, a word about cleaning: standard cleaning with cleaning powder is straightforward. That's the standard cleaning we recommend. Depending on usage, every grinder should also be regularly opened down to the burrs. This is also possible with the Libra without problems. However, the grind setting dial must be removed for this. This is possible without losing the grind setting. However, a screw must be screwed into a plastic holder for this. We're not convinced this is good for durability. We'd rather recommend removing the dial and sparing the plastic holder. That's why we've rated cleaning ability only as "average".

Special Features

The Eureka Libra 65 All Purpose brings some special features that distinguish it from other home grinders. The central feature is, of course, the already extensively discussed integrated scale. Grind-by-Weight is still relatively rare in the home market – only a few models like the Baratza Sette 270Wi, the Zuriga G2 GbW, or the Ligre Siji work with automatic weight dosing. Based on our experience, Eureka's implementation works well and reliably if you follow the mentioned tips (calibration, beans in hopper). Particularly beginners benefit enormously because you don't have to worry about the gram amount and bad shots from incorrect dosing are practically eliminated. The Libra saves constant reweighing and readjustment, which makes espresso brewing more relaxed. Those already experienced will also appreciate the precision and convenience. Compared to pure timer grinders, this really is a next step toward "reach target amount and you're done" – especially when switching grind settings (e.g., from a light to a darker espresso), the Libra shows its strength as it compensates for changed flow time and still dispenses the desired amount.

Another special feature – and the namesake – are the All-Purpose burrs. Eureka advertises that you can cover all common brewing methods with a single grinder. Our tests confirm: the 65 mm flat "High-Uniformity" burrs (that's how you could classify them) deliver excellent grind results both in the fine espresso range and in the coarse filter range. However, as mentioned above, you shouldn't misunderstand the term All Purpose: it is possible to grind espresso and filter, but not without manual adjustments and purge grinds. Ultimately, "All Purpose" here should be read as all-around suitability of the burrs, less as an invitation to jump between espresso and pour over by the minute. The specialty of these burrs is the particle profile with reduced fines, which leads to sweet, clear coffees – in espresso with somewhat less heavy body than, say, a Niche Zero (conical burr) would deliver, but with more clarity; in filter with high cleanliness but minimally less complexity than true filter specialists (e.g., SSP Unimodal burrs) enable. Overall, we're very impressed with what Eureka gets out of standard steel burrs here. If you like, you can optionally swap the burrs for the coated "Black Diamond" burrs that Eureka offers as accessories. These have identical geometry and are primarily intended to increase longevity – in our measurements, there's no difference in particle distribution or taste. A Black Diamond upgrade is worthwhile primarily for heavy users who stress the grinder daily. For normal home baristas, the included burrs are completely sufficient.

Also worth highlighting are the improved details over the previous model, the Eureka Libra 55: Eureka has clearly listened to feedback. For example, a magnetic dosing ring is now included from the factory, which sits cleanly on any 58-mm portafilter. With the first Libra model, we complained that without a chute, coffee grounds spilled over and you absolutely needed a separate dosing ring. The new Libra 65 grinds much neater directly into the portafilter – with lighter and medium roasts often practically without the chute with virtually no scatter. Static has been noticeably reduced, the grounds land more centrally in the basket and build up more nicely. Only with very dark, oily beans (or high Robusta content) is it worth continuing to use the chute to catch any electrostatic scatter. Also new is the already mentioned large grind scale – a blessing for user-friendliness and precision. Overall, the Libra 65 seems more refined and well-thought-out than its predecessor. Many small improvements (larger burrs, less retention, scale firmware, accessories) add up to a significantly better overall package.

Conclusion

The Eureka Mignon Libra 65 All Purpose convinced us in testing with its versatility and reliability. It combines precise weight dosing with high grind quality – and all in a compact, living-room-appropriate form. For home baristas who want an all-in-one grinder, it's an extremely exciting option.

Beginners especially benefit: the scale removes a lot of frustration and error potential from early espresso attempts because the amounts are always correct and you can focus entirely on the grind size. But experienced users also enjoy the convenience of not constantly reaching for a scale. In espresso use, the Libra 65 shows no weakness and shines with consistent, delicious shots. In the filter range, it also delivers good results as long as you're willing to make the switch with some "purge" grinding (intermediate grinding to remove coffee in the retention). You really do get two capabilities in one grinder, though in practice best used alternately as needed, not simultaneously. Of course, not everything is perfect. The dosing accuracy was excellent after calibration for us, but the grinder needs some getting used to when switching beans or recipes – spontaneous switches thanks to All Purpose burrs are only possible with low accuracy for the first cup.

Furthermore, the scale requires a little patience and knowledge: if you stay in the intended workflow (keep beans in the hopper, don't wait too long during operation, etc.), everything runs smoothly. Otherwise, you'll occasionally get an error message or a gram deviation. These are, however, manageable weaknesses that barely matter in everyday use once you've gotten to know the Libra. The grinding speed is about 1 gram per second, which is relatively leisurely – but completely sufficient for home use. Better to grind a bit slower and cooler: even with multiple espressos in a row, the grounds remained cool (max. ~28–34 °C after five pulls) and aromas weren't affected by heat generation.

Noise output is in the upper range; we measure 84.2 decibels. The strengths of the Eureka Libra 65 All Purpose are clearly its weight dosing system, high build quality, and all-around burrs that handle espresso and filter equally well. Weaknesses are mainly the limitations inherent to the concept: as a hopper grinder, it's not ideal for frequent bean or profile switching, and the scale system has occasionally shown minor quirks.

Price-wise, the Libra is around 750 € in the upper mid-range for home grinders. Given the performance offered – 65-mm professional burrs, integrated precision scale, typical Eureka quality – we consider the value for money to be good. You get a piece of technology that was barely available in this form just a few years ago, and can use it to consistently prepare excellent coffee for years to come.

Who is this grinder suitable for? In our view, for ambitious coffee lovers who want to prepare both espresso (main focus) and occasional filter coffee at home and value comfort and accuracy. If, on the other hand, you change beans and brewing method every day, you'll be happier with a single-dosing solution or two separate grinders – the Libra won't play to its strengths. In a normal household scenario with a favorite bean (or at least one bean per week) and the desire for maximum consistency, however, the Libra 65 is a bullseye.

It combines classic Eureka virtues (compact, high-quality, espresso-focused) with modern technology and genuine all-around capability. We give it a clear recommendation – the Eureka Mignon Libra 65 All Purpose is a successful upgrade of its predecessor and enriches the home-barista market with a well-thought-out "can-do-anything" tool. Especially in combination with a good espresso machine, you'll have a lot of joy with this grinder – and discover many a new flavor detail in the cup. Here's to (precisely weighed) coffee!