Acaia Umbra Lunar – display-free coffee scale with Magic Relay
No display, no glow, just a plain surface in anodized aluminum on the drip tray. You start the shot, tap your second Acaia scale next to it – and the Umbra's weight appears there in real time. The scale itself stays quiet and still, your eyes go where you actually need them.
It's a scale that deliberately shows nothing – and that's exactly where its appeal lies: a clean counter, one shared display, a workflow without distraction.
What makes the Acaia Umbra Lunar special
The Umbra Lunar is a display-free scale with Acaia's industrial weighing technology – accurate to 0.1 gram, with an optional resolution of 0.01 gram. Instead of its own screen, it uses the Magic Relay function: it shares its measurement data in real time with another Acaia scale and displays it there. A quick tap is enough, and the display jumps to whichever scale is active. Two devices become one continuous workflow.
It pairs especially well with the Pyxis from our Acaia Collection: the Pyxis brings the precise display, the Umbra sits under the machine and supplies the weight to go with it – a pairing that complements each other very nicely in everyday use. It also works just as well with the Pearl or the Lunar. And if you'd rather not run a second scale, you simply connect the Umbra via Bluetooth to the Acaia app and read the values on your phone.
Because there's no display, it uses very little power: 40 to 48 hours of active use, up to 14 days on standby. The anodized aluminum housing is water-resistant and shrugs off splashes near the machine. Care is simple – a soft cloth with warm water is enough; it's best to avoid cleaning agents or solvents so the anodized surface stays intact.
For us, that fits into a simple conviction: good coffee starts with ratio, and an espresso at roughly a 1:2 ratio depends on getting the input and output amounts right. No shot is ever quite like yesterday's, because the bean, the humidity and the person all change daily. The Umbra makes the weight visible right where you need it – the rest is up to you. Whether you want a display-free second scale is purely a matter of taste. You want it, or you don't, and that's just our view, one of many.
At a Glance
| Model |
Acaia Umbra Lunar (AUL001) |
| Accuracy |
0.1 g (optional 0.01 g) |
| Maximum Capacity |
1000 g |
| Units |
g / oz |
| Dimensions (W × L × H) |
105 × 105 × 15 mm |
| Weight |
300 g (± 5 g) |
| Display |
display-free – via Magic Relay on a paired Acaia scale or app |
| Material |
anodized aluminum, polycarbonate (water-resistant) |
| Battery |
Lithium-ion 3.7 V / 1100 mAh |
| Battery Life |
40–48 hours active, up to 14 days standby |
| Power Supply |
USB-C (5 V / 500 mA) |
| Connectivity |
Bluetooth Low Energy 5.4, Magic Relay |
| Scope of Delivery |
Umbra Lunar, heat-resistant pad, 2 non-slip + 2 friction-reducing protective strips, USB-C cable, 100 g calibration weight |
Who the Umbra Lunar is for
The Umbra Lunar is for anyone who already uses an Acaia scale and wants to extend their workflow – for example with a quiet second scale under the machine, whose readings appear on the existing display. It also appeals to those who value a clean, display-free counter or who prefer to read their values on their phone. Important to know: the Umbra deliberately has no display of its own – you read it via a paired Acaia scale or the app. If you're looking for a standalone scale with a screen, the Lunar or Pearl serves you better. Every setup is welcome here.
What goes with it
The Umbra makes the most sense as part of a pair. You'll find its partner scales – Pyxis, Pearl, Lunar – and the matching accessories in our Acaia Collection. Since it sits under the machine, it's also worth a look at our Espresso Machines.
Looking instead for a first, standalone scale with a display: if you want something compact and affordable, you're in good hands with the Normcore Collection ; if you want the full Acaia experience, stick with Acaia. Not sure what fits your setup? Our advisory tool can help.
Frequently Asked Questions about the Acaia Umbra Lunar
Does the Umbra Lunar have its own display?
No, and that's intentional. The Umbra Lunar is display-free and shows its values via the Magic Relay function on a paired Acaia scale or through the Acaia app on your phone. That saves power and keeps the counter calm.
Which devices can the Umbra Lunar connect with?
Via Magic Relay it pairs with other Acaia scales – particularly well with the Pyxis, and just as well with the Pearl or the Lunar. Alternatively, you can connect it directly to the Acaia app via Bluetooth. That way it shares its weight in real time and you work with one shared display.
Do I absolutely need a second Acaia scale?
No. You can also use the Umbra Lunar on its own via the Acaia app on your phone. Its real strength, though, comes out when it's paired, sharing display and data with a second Acaia scale.
How do I clean the Umbra Lunar?
With a soft cloth and warm water. Avoid cleaning agents, solvents or extended soaking, since these can attack the anodized coating on the aluminum housing.
Can I see the Acaia Umbra Lunar before buying?
Very much so. As importer of Acaia, we're happy to show you the Umbra Lunar live in our showrooms in Bern (Gerberngasse 44) and Zurich (Hagenholzstrasse 50b). Not every model is on site at all times; just get in touch beforehand and we'll have it ready. We deliver in 2 to 4 business days Switzerland-wide and to Liechtenstein, and Click & Collect is also available in Bern and Zurich.
Roastery Tip
We like the Umbra where space is tight and the main scale's display is within reach anyway. For the espresso that follows, we like to reach for Cozy Chocolate and Nutty Delight – rich, sweet, dense. If you love it full and round without any acidity, stick with Very Nutty; for a fruity experience, Wild Peach goes into the grinder. That's our recommendation, one of many, and any bean that tastes good to you is the right one.
