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 frills, no distracting graphics. The Acaia Lunar is an object you pick up and immediately understand: no expense was spared here. The anodized aluminum is cool and smooth, the weight is just right – not too light, not too heavy to be bothersome. A device that sits on the counter daily and looks like it's always been there.
The Lunar is the espresso version in the Acaia family – flat enough (15.5 mm) to fit on virtually any drip tray, robust enough for daily bar use, with real-time flow rate display and all the auto modes relevant for 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, optional 0.01 g for the last degree of precision. The flow rate appears in real-time as an LED bar on the display – you see not only how much flows into the cup, but how fast. An uneven flow shows up in the indicator before it shows up in the cup. Channeling, flow spike during pre-infusion transition, a puck breaking through at the end – everything becomes visible during the shot, not just afterwards by smelling and tasting. Stabilization time under one second. The auto-tare system automatically tares when the portafilter is placed, the auto-timer starts with the first drop.
Bluetooth 4.0, Acaia App (iOS and Android). The Lunar works with any espresso machine – ECM, Rocket, Bezzera, Lelit, La Marzocco, Flair. No app pairing with the machine is necessary. A standalone espresso scale that fits any setup.
Construction – Aluminum and Water Resistance
The housing is anodized aluminum with a water-resistant coating. Drops from the portafilter, a spilled shot, the morning wipe with a damp cloth – the Lunar is built for it. The heat-resistant 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 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 |
approx. 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 |
| Scope of Delivery |
Lunar, heat-resistant 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. For anyone who wants to combine a scale with any machine – without manufacturer binding, without compromising on accuracy. For anyone who perceives an espresso scale as a conscious object on the counter and values a device that feels and looks the same after years of daily use.
If you're looking for a more affordable scale: Normcore Scales (exclusive Swiss importer) cover the most important functions – without an app, without a flow rate indicator, but at a significantly lower price. If you're looking for a larger scale for pour-over and filter coffee: the Acaia Pearl 2021 is the Lunar's bigger sister – more surface area for pour-over workflows, the same Acaia characteristics in workmanship.
Lunar on the La Marzocco Linea Mini R
Since March 2026, there has been a way that is the most elegant for many La Marzocco Mini R buyers: The Lunar 2021 with USB-C port (serial number AL008XXXXXXXX or higher) can be upgraded to a full-fledged brew-by-weight scale for the Mini R via a one-time Connected Scale license – around 100 euros via the La Marzocco App. The license is installed via firmware upgrade in the Acaia App, the process takes about five minutes. Afterwards, the Lunar communicates directly with the Mini R via Bluetooth: set target weight, flip the paddle, Mini R stops automatically at the target weight – with a predictive algorithm that accounts for post-drip.
Important for compatibility: Only the Lunar 2021 with USB-C port (serial number from AL008) can perform the upgrade. Older Lunar models with a Micro-USB port are not compatible – the internal electronics are different. Anyone who buys a compatible Lunar from us gets two tools in one: a full-fledged espresso scale with app, flow rate display, and all Acaia functions for any machine – and after the license upgrade, the Connected Scale functionality on the Mini R. The Lunar upgrade is not mandatory – the Lunar also works excellently on the Mini R, as on any other machine, without a license.
Order directly online
The Acaia Lunar can be ordered directly from the webshop in all three colors (Black, White, Silver). Delivery throughout Switzerland and to Liechtenstein in 2 to 4 working days. Click and Collect in Bern, Gerberngasse 44 and Zurich, Hagenholzstrasse 50b. The Lunar is ready to be touched there – the finish and weight speak for themselves as soon as you hold it in your hand.
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 espresso machine. Typical setups from the showroom: La Marzocco Linea Micra, La Marzocco Linea Mini R, Rocket, ECM, Profitec. Also a reliable companion for manual lever extraction on the Flair Espresso 58+2 (exclusive Swiss importer).
For grinders without integrated scales: 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 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 is the difference between Acaia Lunar and Acaia Pearl?
The Lunar is optimized for espresso – flat (15.5 mm), small (105 × 105 mm), fits on virtually 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 area, more brewing modes for manual brewing methods. Both with Bluetooth 4.0, Acaia App, and flow rate display. If you do both, combine the Lunar with the Pearl – the Lunar at the machine, the Pearl at the brew bar.
In what colors is the Acaia Lunar available?
Black, White, and Silver – all three available. The finish and weight are most convincing when you hold the scale in your hand. Compare them live in the showrooms in Bern and Zurich.
Does the Acaia Lunar work with every espresso machine?
Yes – machine-independent. No app pairing with the machine is necessary. The Lunar works with any machine that has a drip tray with enough space. For very low cup clearances, the Lunar's 15.5 mm height is a clear advantage over thicker scales.
What does the optional 0.01 g resolution mean?
The Lunar displays to 0.1 g by default. In advanced mode, it displays to 0.01 g – an additional digit for those who want even more precise dosing. Activatable directly via the scale or the Acaia App.
I have a La Marzocco Linea Mini or Mini R – is there anything I need to know?
Since March 2026, compatible Lunar models (USB-C, serial number AL008XXXXXXXX or higher) can be upgraded to a La Marzocco Connected Scale via firmware upgrade. 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 mandatory – the Lunar also works excellently on the Linea Mini R without the upgrade. Older Lunar models with Micro-USB port are not upgradable.
Can I see the Acaia Lunar before buying?
Yes. In the showrooms in Bern (Gerberngasse 44) and Zurich Oerlikon (Hagenholzstrasse 50b), the Lunar is ready to be touched. The finish, weight, and display cannot be conveyed through photos.
How fast is the Lunar delivered in Switzerland?
2 to 4 business days throughout Switzerland and to Liechtenstein. Click and Collect in Bern and Zurich.
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 Zurich.
Roastery Tip
What the Lunar shows daily in the showroom: Once you've extracted with a flow rate display, you're reluctant to go back. With Cozy Chocolate, we see a calm, even flow on the Lunar – the bean extracts well, the indicator remains stable in the ideal range. Nutty Delight behaves similarly reliably. Wild Peach shows more clearly on the Lunar than on a simple scale how light roasts with their denser puck structure require a slower, more controlled flow – if the indicator jumps too quickly, the grind is too coarse. This is our observation, one of many.
