Compak Fino in the Test: do you need the scale?

After grinding, 0.3 grams of coffee remain inside the Compak Fino Scale. This minimal "retention" is among the best values in our testing benchmark of over 100 coffee grinders. The Fino is a single-dosing grinder with 63 mm conical burrs, manufactured by Spanish brand Compak.

In the past, Compak made headlines primarily with affordable commercial grinders. Transitioning into home single-dosing grinders marks a new direction for the brand, and our review proves it to be a very successful move. The Compak Fino delivers.

We first spotted this model roughly three years ago at HOST in Milan, but it has only recently hit the market. It comes in two versions: with an integrated scale for around €790 and without a scale for around €599 (as of September 2026).

Which brings us straight to the central question guiding this test: Why does a single-dosing grinder need an integrated scale located underneath the catch cup?

A Penguin That Has Bounced Off the Ceiling Once Too Often

The Fino looks unlike anything else in our lineup. We purchased the blue model, and Michel and I couldn't quite agree on its shape during the video review: somewhere between a tuxedoed penguin and a kitchen juicer. It's a matter of taste. Build quality, on the other hand, leaves no room for debate. The chassis feels solid, nothing rattles, and panel gaps are cleanly aligned. Weighing in at 7 kg, it sits firmly anchored on the countertop.

The spec sheet lists a height of 308 mm when closed and 405 mm with the lid flipped open. The Scale version stands slightly taller at 34.5 cm. Measuring 16 cm wide and 23 to 24 cm deep (including the power cable), it fits under most kitchen cabinets, though only when closed.

Included in the box are a cleaning brush, a screwdriver, a cloth, and a bellows. The bellows sits snugly inside the chute and doesn't pop out loose, which is a frequent annoyance on other grinders. A few quick pumps after grinding clear out any remaining chaff cleanly. The dosing cup features a rounded base that strongly resembles the catch cup on the Niche Zero. It works well and fits flush onto 58 mm portafilters.

However, at 250 grams, it is exceptionally heavy. Alternative dosing cups in our lineup weigh under 80 grams while performing identically. Static electricity causes minor retention inside the cup. A light tap on the side, a quick fluff, invert into the portafilter, and you're done.

Attentive observers will notice several other design and structural similarities to the Niche Zero.

63 mm Conical Burrs at 270 RPM and a Dial Scale That Is a Joy to Use

Inside, a 63 mm conical burr set is driven by a 280-watt geared motor spinning at a slow 270 RPM. There is no variable RPM control; motor speed is fixed.

The grind adjustment ring is the absolute highlight of this grinder. Turning the outer collar reveals a stepless dial with fine tick marks spaced so closely that moving one tick alters extraction time by roughly one to two seconds. That allows you to dial in espresso with immense precision. We recently tested a grinder costing four times as much that handled grind adjustment far worse. Thank you for this, Compak.

One caveat must be mentioned, which can cause early frustration: Factory calibration out of the box was too coarse for espresso. We had to reset the zero point using the internal calibration ring. While this procedure is built into the design and takes only a minute, it shouldn't be necessary out of the box and can intimidate beginner home baristas.

15.4 Grams in 10 Seconds and 77.9 Decibels

Grinding an 18-gram dose takes 14.3 seconds, which translates to 15.4 grams in 10 seconds. This puts it among the slower single-dosing grinders in our benchmark field. That is due to the low RPM motor—a deliberate tradeoff for in-cup quality. For home barista use, grinding speed is generally secondary anyway.

On the flip side, the Fino is impressively quiet, measuring 77.9 dB(A) at a distance of 20 cm under load. Registering under 80 dB is a great score for a coffee grinder, and the acoustic profile remains low-pitched and smooth, without high-pitched whines or motor strain. Eight seconds of operation, and then silence.

Grinding Temperature and Consistency: No Heat Issues

Coffee beans start at a room temperature of 21.4 °C before testing. Across five consecutive 20-second grinding runs with 20-second pauses between shots, ground coffee temperature ranged between 26.3 °C and 30.7 °C, averaging 28.4 °C. Crucially, heat buildup across the series was minimal. The grinder does not run hot, meaning you won't need to pause between shots even when dialing in delicate light roasts.

In dosing consistency across consecutive shots, we measured a standard deviation of 0.11 grams. That is an excellent result. One interesting detail: using RDT (a tiny spritz of water droplets on the beans before grinding) slightly increased the variation to 0.148 g, whereas vacuuming the chamber dropped it to 0.055 g. The Fino doesn't require RDT for dosing accuracy, though a light spritz still helps tame static inside the catch cup.

0.3 Grams Retention: Among the Lowest We Have Ever Measured

Total retention stands at an exceptionally low 0.3 grams. Of that, 0.2 g is exchange retention (exchanged with each dose), and only 0.1 g remains permanently trapped inside the chamber. We only gathered that 0.1 g after meticulously scraping every micro-particle from the internal surfaces.

This is top-tier performance for this category, largely due to its physical design. Conical burr sets naturally present fewer internal ledges and crevices where grounds can accumulate; grounds simply fall straight through. In practice: when you feed in 18 grams, the dose that comes out is truly your dose. And if you follow a regular espresso with a decaf, you carry over a negligible 0.3 g from the previous shot—an imperceptible amount in the cup. That is precisely what single dosing promises.

Because exchange retention is so low, you don't need to strip and clean the burr chamber weekly. Cleaning once a month under regular use is plenty (or twice monthly for oily dark roasts, as residual coffee oils oxidize quickly). Disassembly is straightforward: the chute detaches magnetically, the outer adjustment ring unscrews, and a hex bolt unlocks access to the burr cone. While it requires a tool, the included screwdriver makes the process take just a few minutes. Running cleaning tablets through occasionally is good practice for any grinder.

Single-Dosing Performance and the Question of the Scale

Feed 18 grams in, and you get at least 17.8 grams out. That is fantastic performance. The grinder clears itself completely without help; using the bellows is optional rather than required.

Which brings us to the scale. It sits beneath the spout, unconnected to any motor logic—it doesn't control shut-off or talk to the grinder. It simply displays the weight resting in the cup. On a grinder that retains only 0.3 grams, this is the one piece of information you don't need, because with single dosing you already weigh your beans before grinding.

The scale could be used to weigh whole beans before loading them into the hopper, saving counter space by eliminating an external scale. We tried this workflow, but concluded it doesn't justify the €200 price premium. Michel wouldn't pay extra for it, and neither would I.

Grind Setting Repeatability: 4 to 5 Seconds Drift

As impressive as the adjustment scale looks, it doesn't quite hold up to its visual promise. We dialed in an espresso recipe at setting 30: 18 g in, 45 g out in 25 seconds. We then adjusted coarse for a lungo, fine for a ristretto, and returned the dial visually back to setting 30. The resulting shots ran through in 20 and 21 seconds—4 to 5 seconds faster than the baseline setup. Particle analysis confirmed this shift: x50 measured 210.8 microns initially, shifting to 238.5 microns upon returning to the mark.

The cause lies in thread tolerance. The adjustment collar acts as a large threaded screw, requiring mechanical play to turn smoothly. In espresso brewing, we work within a burr gap clearance of roughly 80 to 100 microns (the thickness of a sheet of paper). A shift of just 2 to 3 microns alters extraction time by several seconds. Practical tip: When returning to a saved recipe, always approach your target mark from the same direction (e.g., sweeping from coarse to fine past a reference mark at 50). And be prepared to make a minor micro-adjustment after switching recipes.

Particle Size Distribution: 40% Fines and a Narrow Peak for a Conical Burr

We analyze particle size distribution in collaboration with the ZHAW using a Retsch Camsizer X2. At our baseline espresso setting (T4), we measured an x50 of 210.8 microns, a fines ratio of 40.4% (particles below 100 microns), and a main peak width of 252.6 microns.

A 40% fines ratio is high. In the cup, this translates to more body, higher mouthfeel texture, and greater puck resistance, requiring a slightly coarser grind setting compared to flat-burr grinders producing fewer fines. At the same time, the primary peak width of 252.6 microns is remarkably narrow for a 63 mm conical burr. Conical burr sets often yield much wider particle spreads; anything under ~300 microns extracts evenly enough in espresso to taste balanced.

This particle profile favors medium to darker roast styles where sweetness and body are prioritized. Home baristas seeking light specialty roasts with maximum flavor clarity will find flat-burr grinders better suited. The Fino can grind light roasts without issue, but they will present with more body and less flavor separation.

Secondary test runs confirmed consistent scaling: For ristretto (T5), x50 dropped to 187.8 microns with 41.6% fines; for lungo (T6), x50 rose to 297.2 microns while fines dropped to 33.7%.

In the Cup: Rich Sweetness, Integrated Acidity, Medium Body

We evaluated the Fino using our Toca roast from Mexico. The espresso delivered a medium body, crisp yet well-integrated acidity, and a rounded sweetness. Our testing benchmark coffee, Apas, also performed admirably.

That sums it up well. The Fino doesn't extract delicate floral top-notes from complex light roasts, but it reliably delivers a satisfying, body-forward espresso that is forgiving during dialing in. For exploring diverse roasts across the medium-to-dark spectrum, it's a great companion.

Technical Specifications Overview

As always, we purchased this grinder independently. This review was not commissioned or sponsored by Compak.