Acaia Lunar – espresso scale with Bluetooth, flow rate display, and USB-C
It sits on the drip tray and says nothing – until the shot begins. Then the display shows exactly what it should: grams, time, flow rate. No flourishes, no distracting graphics. The Acaia Lunar is an object you pick up and understand immediately: nothing was cut here. The anodized aluminum is cool and smooth, the weight is exactly right – not too light, not too heavy to get in the way. A device that sits on the counter every day and looks like it's always been there.
The Lunar is the espresso variant in the Acaia family – slim enough (15.5 mm) to fit on practically any drip tray, robust enough for daily bar use, with a real-time flow rate display and all the auto modes relevant to espresso. Coffee Coaching Club is the exclusive Swiss importer of selected Acaia products and carries the Lunar in all available colors.
What the Lunar measures – and how
0.1 g resolution, optionally 0.01 g for that last degree of precision. The flow rate appears in real time as an LED bar on the display – you see not just how much is flowing into the cup, but how fast. An uneven flow shows up in the indicator before it shows up in the cup. Channeling, a flow spike at the pre-infusion transition, a puck breaking through toward the end – all of it becomes visible during the shot, not only afterward through smell and taste. Stabilization time under one second. The auto-tare system tares automatically when you set the portafilter down, and the auto-timer starts on the first drop.
Bluetooth 4.0, Acaia App (iOS and Android). The Lunar works with any portafilter machine – ECM, Rocket, Bezzera, Lelit, La Marzocco, Flair. No app pairing with the machine required. A standalone espresso scale that fits any setup.
Build – aluminum and water resistance
The housing is anodized aluminum with a water-resistant coating. Drips from the portafilter, a spilled shot, the morning wipe-down with a damp cloth – the Lunar is built for that. The heat protection pad (included) sits between the cup and the scale and protects the electronics from hot cup bottoms. USB-C charging, lithium-ion battery with 30 to 40 hours of runtime – if you pull one shot a day, you charge it about once a quarter.
At a glance
| Model |
Lunar 2021 (USB-C, model number from AL008) |
| Dimensions (W × L × H) |
105 × 105 × 15.5 mm |
| Weight |
ca. 265 g |
| Maximum capacity |
2000 g |
| Resolution |
0.1 g (optional 0.01 g) |
| Repeatability |
0.1 g |
| Stabilization time |
under 1 second |
| Flow rate display |
Real-time LED bar |
| Auto modes |
Auto-Tare, Auto-Timer (starts with flow), Tare Save |
| Display |
LED, Dual Display mode |
| Connectivity |
Bluetooth 4.0, Acaia App (iOS and Android) |
| Battery |
Li-ion 1100 mAh, 30–40 hours, USB-C |
| Housing |
Anodized aluminum, water-resistant coating |
| Units |
Grams, ounces |
| Colors |
black, white, silver |
| What's included |
Lunar, heat protection pad, USB-C cable, 100 g calibration weight |
| Warranty |
2 years |
Who the Lunar is for
The Lunar is for anyone who makes espresso daily and wants to know what's happening while they do it. For anyone who wants a scale that combines with any machine – no manufacturer lock-in, no compromise on accuracy. For anyone who sees an espresso scale as a deliberate object on the counter and cares that the device they hold every day still looks and works the same years later.
If you're looking for a more affordable scale: Normcore scales (exclusive Swiss importer) cover the essential functions – without an app, without a flow rate indicator, but at a noticeably lower price. If you're looking for a larger scale for pour-over and filter coffee: the Acaia Pearl 2021 is the larger sibling of the Lunar – more surface for pour-over workflows, the same Acaia character in the build quality.
Lunar on the La Marzocco Linea Mini R
Since March 2026, there's been a path that many Mini R buyers find the most elegant: the Lunar 2021 with a USB-C port (serial number AL008XXXXXXXX or higher) can be upgraded via a one-time Connected Scale license – around 100 euros through the La Marzocco App – into a full brew-by-weight scale for the Mini R. The license installs as a firmware upgrade in the Acaia App, and the process takes about five minutes. After that, the Lunar communicates directly with the Mini R over Bluetooth: set your target weight, flip the paddle, and the Mini R stops automatically at the target weight – with a predictive algorithm that accounts for after-drip.
Important for compatibility: only the Lunar 2021 with a USB-C port (serial number from AL008) can run the upgrade. Older Lunar models with a Micro-USB port aren't compatible – the internal electronics are different. If you buy a compatible Lunar from us, you get two tools in one: a full espresso scale with app, flow rate display, and all Acaia functions for any machine – and, after the license upgrade, Connected Scale functionality on the Mini R. The Lunar upgrade isn't required – the Lunar works excellently on the Mini R, as on any other machine, without the license too.
Order directly online
The Acaia Lunar can be ordered directly in the webshop in all three colors (black, white, silver). Delivery throughout Switzerland and to Liechtenstein in 2 to 4 business days. Click and collect in Bern, Gerberngasse 44 and Zürich, Hagenholzstrasse 50b. There the Lunar is ready to handle – the finish and the weight speak for themselves the moment you hold it.
For questions about the Connected Scale upgrade, Mini R integration, or the Acaia App: office@coffeecoachingclub.ch or by phone during business hours.
What goes with it
The Lunar works with any portafilter machine. Typical setups from the showroom: La Marzocco Linea Micra, La Marzocco Linea Mini R, Rocket, ECM, Profitec. Also for manual lever extraction on the Flair Espresso 58+2 (exclusive Swiss importer), a reliable companion.
For grinders without a built-in scale: Varia VS3 or VS6 (exclusive Swiss importer), Weber Workshops EG-1 (exclusive Swiss importer), Comandante C40 as a hand grinder. For puck prep: Normcore WDT tool and tamper or Weber Workshops Moonraker. For airtight bean storage: Airscape. For precise coffee water: Apax Labs mineral concentrates (exclusive Swiss importer).
Frequently asked questions
What's the difference between the Acaia Lunar and the Acaia Pearl?
The Lunar is optimized for espresso – slim (15.5 mm), small (105 × 105 mm), fits on practically any drip tray, with auto modes for espresso. The Pearl is larger (160 × 160 × 32 mm), designed for pour-over and filter coffee – more surface, more brewing modes for manual brew methods. Both come with Bluetooth 4.0, the Acaia App, and a flow rate display. If you do both, you combine the Lunar with the Pearl – the Lunar on the machine, the Pearl on the brew bar.
What colors is the Acaia Lunar available in?
Available in black, white, and silver – all three in stock. The finish and the weight are most convincing when you hold the scale in your hand. Compare them live in the showrooms in Bern and Zürich.
Does the Acaia Lunar work with every espresso machine?
Yes – machine-independent. No app pairing with the machine required. The Lunar works with any machine that has a drip tray with enough space. With very low cup clearance, the Lunar's 15.5 mm height is a clear advantage over thicker scales.
What does the optional 0.01 g resolution mean?
By default, the Lunar displays to 0.1 g. In extended mode, it displays precisely to 0.01 g – one extra digit for anyone who wants to dose even more precisely, activated directly on the scale or through the Acaia App.
I have a La Marzocco Linea Mini or Mini R – is there anything to know?
Since March 2026, compatible Lunar models (USB-C, model number AL008XXXXXXXX or higher) can be upgraded via a firmware upgrade to the La Marzocco Connected Scale. This unlocks Brew-by-Weight on the Mini R and Grind-by-Weight on the Mahlkönig Pico. Upgrade license: around 100 euros, installed in five minutes. Not required – the Lunar also works excellently on the Linea Mini R without the upgrade. Older Lunar models with a Micro-USB port can't be upgraded.
Can I see the Acaia Lunar before I buy?
Yes. In the showrooms in Bern (Gerberngasse 44) and Zürich Oerlikon (Hagenholzstrasse 50b), the Lunar is ready to handle. The finish, the weight, and the display just don't come across in photos.
How quickly is the Lunar delivered in Switzerland?
2 to 4 business days throughout Switzerland and to Liechtenstein. Click and collect in Bern and Zürich.
Where can I buy the Acaia Lunar in Switzerland?
At Coffee Coaching Club. We carry the Lunar in all three colors (black, white, silver) as well as the complementary Pearl 2021. Order via coffeecoachingclub.ch, by phone during business hours, or in the showrooms in Bern and Zürich.
Roastery tip
What the Lunar shows in the showroom every day: once you've extracted with a flow rate display, you rarely want to go back. With Cozy Chocolate we see a calm, even flow on the Lunar – the bean extracts nicely, and the indicator stays stable in the ideal range. Nutty Delight behaves just as reliably. Wild Peach shows on the Lunar, more clearly than on a simple scale, how light roasts with their denser puck structure need a slower, more controlled flow – if the indicator jumps too fast, the grind is too coarse. That's our observation, one of many.
