Discover Operation Modes of Umbra Duo: Auto Tare and Timer with Flow Detection
Magic Relay Function in Action with Umbra Series
Discover Operation Modes of Umbra Duo: Auto Timer with Flow Detection
How to fair your scale with Umbra Series
✨ New Arrivals Just Dropped!Explore
Acaia Umbra Duo Weighing Scale - Expanded Weighing Platform with ReacX Technology
The Acaia Umbra Duo is a professional-grade espresso scale that integrates industrial-strength ReacX™ technology into a sleek, display-free anodised aluminium body. This minimalist design is specifically engineered for high-volume commercial environments, offering enhanced stability and significantly reduced energy consumption for a longer battery life. Unlike the standard Lunar, the Umbra Duo features an expanded weighing platform, providing ample space to accommodate a full-sized portafilter or two cappuccino cups simultaneously. While it can operate as a standalone unit via smartphone apps, its primary strength lies in its ability to provide unmatched precision and repeatability for every shot.
Central to its innovation is the patent-pending Magic Relay function, which enables real-time communication between multiple Acaia devices. This technology allows the Umbra Duo to share measurement data instantly with a paired Acaia scale, such as a Lunar or Pearl, which then acts as its external display. The system is designed for a seamless workflow; as the weight shifts, the paired display updates automatically or switches views with a simple tap. This boundless connectivity creates a flexible, high-efficiency brewing station that simplifies the dial-in process for both busy commercial coffee shops and dedicated home baristas.
Acaia Umbra Duo Scale User Manual
Acaia Umbra Duo Scale Quick Start Guide
You get all of these Freebies when you purchase through Prime Coffee Suppliers:
-
Free! Delivery (Worth £60) 1-3 days Free Standard UK Delivery, Direct from UK Warehouse, Or 2-4 Days direct from warehouse in Milan.
- Free! 12 Months Parts Warranty
Features
Magic Relay Switching: Instantly shares weight data with a paired Acaia Pearl or Lunar display for a distraction-free bar.
Acaia ReacX Technology: Industrial-grade sensors provide the highest level of accuracy and weight repeatability available.
Energy-Efficient Design: The display-free silhouette significantly reduces power draw, ideal for eco-conscious commercial setups.
Espresso-Proof Build: Machined from durable aluminium to survive the heat, steam, and spills of a professional drip tray.
Specification of Acaia Umbra Duo Weighing Scale
| Attribute | Details |
| Model | AUL101 |
| Dimensions | 105 mm (W) x 210 mm (L) x 21 mm (H) |
| Product Weight | 490 g ± 5 g |
| Maximum Capacity | 1500 g / 52.91 oz (Indication Limit: 1530 g / 53.97 oz) |
| Readability | 0.1 g / 0.01 g |
| Min. Weight | 0.1 g / 0.01 g |
| Performance | Repeatability: 0.1 g |
| Measuring Units | g / oz |
| Material | Anodised Aluminium, PC |
| Connectivity | Bluetooth Low Energy 5.4 |
| Power & Battery | 5 V / 500 mA; Lithium-ion rechargeable (3.7 V 1100 mAh) |
| Battery Life | 40–48 hours continuous use; Up to 14 days Standby |
| Package Contents | Umbra Duo Scale, 100g Calibration Weight, USB-C Cable, Heat Resistant Pad, Non-slip & Friction-reduction Protective Strips |
The Workflow Evolution: Why the Acaia Umbra Duo is the New Bench Standard
In the world of high-end espresso, the Acaia Umbra Duo represents a bold shift toward minimalist design and "invisible" technology. While the original Lunar was defined by its compact footprint and bright LED feedback, the Umbra Duo reimagines the professional workflow by removing the built-in display and doubling the surface area. It is not just a scale; it is an intelligent, expansive extension of a connected ecosystem, designed for baristas who need more room to move without sacrificing an ounce of precision.
1. Magic Relay Technology
The defining feature of the Umbra series is Magic Relay. Since the scale itself has no screen, it uses Bluetooth Low Energy 5.4 to transmit weight data instantly to a paired device.
-
Why you need it: You can pair the Umbra Duo with a Lunar, a Pearl, or a smartphone. When you place your portafilter or cups on the Duo, the weight appears seamlessly on your secondary device. This allows for a unified data setup where one screen manages your entire station, keeping your workspace looking clean, sleek, and uncluttered.
2. Acaia ReacX™ Industrial Precision
Hidden beneath the matte black anodised aluminium is the new Acaia ReacX™ weighing technology. This is the most advanced sensor suite Acaia has ever produced, offering unmatched accuracy and repeatability.
-
Why you need it: ReacX technology offers industrial-grade performance with nearly zero latency. In a commercial environment where consistency is king, the Umbra Duo ensures the weight you see is the absolute truth, stabilising faster than almost any other scale on the market to reflect the real weight with minimal error.
3. The Expanded Double-Platform
Compared to the standard Lunar, the Umbra Duo features a double-sized weighing pan.
-
Why you need it: This expanded platform (210 mm in length) meets multiple commercial needs. It is the ideal size for dosing directly into a portafilter or for brewing two cappuccino cups at once on an espresso machine. It provides the extra room needed to dial in perfection without the risk of cups sliding off the edge.
4. Sustainable, Ultra-Efficient Performance
By removing the power-hungry LED display, the Umbra Duo drastically reduces its energy footprint.
-
Why you need it: The Duo offers a remarkable battery life of 40–48 hours of continuous use. For a busy cafe, this means fewer charging cycles and a significantly longer overall lifespan for the internal lithium-ion battery, making it an environmentally friendly choice that promotes sustainability.
5. Boundless Connectivity & Durability
Milled from anodised aluminium, the Umbra series provides enhanced stability for demanding commercial settings. Because it lacks a display window, it is more rugged and easier to maintain.
-
Why you need it: Through Acaia's apps, you can customise every parameter of your workflow. Whether you are monitoring split shots or managing high-volume service, the Duo provides unparalleled flexibility. It connects effortlessly to the latest Acaia ecosystem, ensuring your coffee bar remains at the cutting edge of brewing technology.
The Acaia Umbra Duo is for the barista who needs the data of a laboratory with the workspace of a professional kitchen. It eliminates the visual noise of blinking screens and the physical limitations of small scales, allowing you to focus entirely on the craft. It is a rugged, ultra-precise, and environmentally conscious tool that proves that an expanded platform leads to a more efficient workflow.
Pro Tip: For high-volume bars, pair the Umbra Duo with an Acaia Lunar sitting on the machine. Use the Duo on the bench for portafilter dosing; the Lunar can show your dose weight via Magic Relay, allowing you to dose and pull shots with a single, unified data point.
Acaia Espresso Scales: Choosing Between the Lunar 2021, Umbra, and Brew-by-Weight
When it comes to high-end espresso preparation, Acaia has evolved from a single iconic scale into a sophisticated ecosystem of specialized tools. Understanding the differences between the Lunar 2021, the Umbra Lunar, and the La Marzocco Brew-by-Weight (BbW) scale is key to choosing the right workflow for your bar.
1. Acaia Lunar 2021: The All-Rounder
The Lunar 2021 is the definitive standalone espresso scale. It is designed for baristas who want all their data—weight, time, and flow rate—contained in one robust, visible unit.
-
Key Feature: The Real-Time Flow-Rate Indicator. This LED bar allows you to see exactly how many grams per second are hitting the cup, helping you spot channeling instantly.
-
Best For: Enthusiasts and professionals who need a versatile scale that works on any machine and offers immediate visual feedback.
-
Hardware: USB-C charging, 30–40 hour battery life, and high-visibility LED display.
2. Acaia Umbra Lunar: The Minimalist
The Umbra is a radical departure from traditional design. It has no built-in display, appearing as a sleek, solid block of anodised aluminium. It is designed to be "felt but not seen."
-
Key Feature: Magic Relay technology. Instead of showing weight on its own body, it wirelessly beams the data to a paired Acaia Pearl S or a smartphone.
-
Best For: Minimalist coffee bars or "no-screen" drip trays. It is also more energy-efficient and durable because it lacks the fragile glass/LED window of a traditional scale.
-
Workflow: Typically used in a "Dual Display" setup where a Pearl scale on the bench shows the weight being measured by the Umbra on the drip tray.
3. La Marzocco x Acaia: Brew-by-Weight (BbW)
This is not a standalone scale in the traditional sense; it is a connected instrument developed exclusively for the La Marzocco Linea Mini, Micra, and GS3.
-
Key Feature: Machine Integration. Unlike a standard Lunar that just tells you the weight, this scale talks directly to the La Marzocco electronics. When the scale hits your target weight (e.g., 36g), it sends a signal to the machine to automatically stop the shot.
-
Best For: Owners of La Marzocco home machines who want "set and forget" volumetric precision. It includes a "predictive drip algorithm" that accounts for the coffee still in the air after the pump stops.
-
Hardware: Identical in build to the Lunar 2021 but runs exclusive La Marzocco firmware. Note: As of 2024, standard Lunar 2021 scales can be upgraded to BbW firmware via a paid digital license from Acaia.
| Feature | Lunar 2021 | Umbra Lunar | LM Brew-by-Weight |
| Display | On-device LED | None (Requires Relay) | On-device LED |
| Stop-Shot Function | Manual | Manual | Automatic (with LM) |
| Flow-Rate Bar | Yes | Via App/Relay only | Yes |
| Charging | USB-C | USB-C | USB-C |
| Ideal User | General Pro/Home | Minimalist/Connected Bar | La Marzocco Owners |
Which one do you need?
-
Choose the Lunar 2021 if you want the best all-around scale that provides immediate, easy-to-read data for any espresso machine.
-
Choose the Umbra Lunar if you want a clean, "invisible" aesthetic on your machine and already own (or plan to own) an Acaia Pearl to act as your display.
-
Choose the Brew-by-Weight Scale if you own a La Marzocco and want the machine to handle the precision of stopping the shot for you, ensuring every espresso is identical without you watching the clock.
Acaia Umbra Lunar Support
Explore our Acaia Umbra Lunar Support resources to master your new equipment. Here you will find a dedicated library of videos covering essential maintenance tips and step-by-step guides on how to use the product to its full potential.
Discover Operation Modes of Umbra Duo: Dual Weight Display
About Acaia
Founded in 2014, Acaia was born from a simple yet ambitious mission: to merge laboratory-grade technology with beautiful, minimalist design for the specialty coffee community. The company first gained global attention with the successful Kickstarter launch of the Acaia Pearl in 2013, which set a new standard for what a coffee scale could be. Acaia believes that the future of coffee equipment lies in the seamless integration of hardware and software, a philosophy evident in their suite of Bluetooth-connected apps and firmware-upgradeable devices.
Acaia is more than just a manufacturer; it is a brand deeply rooted in quality and community. Every product is hand-built using high-quality components designed to withstand the rigours of a commercial environment while maintaining an aesthetic that elevates any coffee bar. By collaborating with manufacturers and listening to feedback from baristas worldwide, Acaia continues to push the boundaries of extraction control, transforming the ritual of brewing into a precise and repeatable science.
$95.25
Original: $272.15
-65%Acaia Umbra Duo Weighing Scale - Expanded Weighing Platform with ReacX Technology—
$272.15
$95.25Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Acaia Umbra Duo is a professional-grade espresso scale that integrates industrial-strength ReacX™ technology into a sleek, display-free anodised aluminium body. This minimalist design is specifically engineered for high-volume commercial environments, offering enhanced stability and significantly reduced energy consumption for a longer battery life. Unlike the standard Lunar, the Umbra Duo features an expanded weighing platform, providing ample space to accommodate a full-sized portafilter or two cappuccino cups simultaneously. While it can operate as a standalone unit via smartphone apps, its primary strength lies in its ability to provide unmatched precision and repeatability for every shot.
Central to its innovation is the patent-pending Magic Relay function, which enables real-time communication between multiple Acaia devices. This technology allows the Umbra Duo to share measurement data instantly with a paired Acaia scale, such as a Lunar or Pearl, which then acts as its external display. The system is designed for a seamless workflow; as the weight shifts, the paired display updates automatically or switches views with a simple tap. This boundless connectivity creates a flexible, high-efficiency brewing station that simplifies the dial-in process for both busy commercial coffee shops and dedicated home baristas.
Acaia Umbra Duo Scale User Manual
Acaia Umbra Duo Scale Quick Start Guide
You get all of these Freebies when you purchase through Prime Coffee Suppliers:
-
Free! Delivery (Worth £60) 1-3 days Free Standard UK Delivery, Direct from UK Warehouse, Or 2-4 Days direct from warehouse in Milan.
- Free! 12 Months Parts Warranty
Features
Magic Relay Switching: Instantly shares weight data with a paired Acaia Pearl or Lunar display for a distraction-free bar.
Acaia ReacX Technology: Industrial-grade sensors provide the highest level of accuracy and weight repeatability available.
Energy-Efficient Design: The display-free silhouette significantly reduces power draw, ideal for eco-conscious commercial setups.
Espresso-Proof Build: Machined from durable aluminium to survive the heat, steam, and spills of a professional drip tray.
Specification of Acaia Umbra Duo Weighing Scale
| Attribute | Details |
| Model | AUL101 |
| Dimensions | 105 mm (W) x 210 mm (L) x 21 mm (H) |
| Product Weight | 490 g ± 5 g |
| Maximum Capacity | 1500 g / 52.91 oz (Indication Limit: 1530 g / 53.97 oz) |
| Readability | 0.1 g / 0.01 g |
| Min. Weight | 0.1 g / 0.01 g |
| Performance | Repeatability: 0.1 g |
| Measuring Units | g / oz |
| Material | Anodised Aluminium, PC |
| Connectivity | Bluetooth Low Energy 5.4 |
| Power & Battery | 5 V / 500 mA; Lithium-ion rechargeable (3.7 V 1100 mAh) |
| Battery Life | 40–48 hours continuous use; Up to 14 days Standby |
| Package Contents | Umbra Duo Scale, 100g Calibration Weight, USB-C Cable, Heat Resistant Pad, Non-slip & Friction-reduction Protective Strips |
The Workflow Evolution: Why the Acaia Umbra Duo is the New Bench Standard
In the world of high-end espresso, the Acaia Umbra Duo represents a bold shift toward minimalist design and "invisible" technology. While the original Lunar was defined by its compact footprint and bright LED feedback, the Umbra Duo reimagines the professional workflow by removing the built-in display and doubling the surface area. It is not just a scale; it is an intelligent, expansive extension of a connected ecosystem, designed for baristas who need more room to move without sacrificing an ounce of precision.
1. Magic Relay Technology
The defining feature of the Umbra series is Magic Relay. Since the scale itself has no screen, it uses Bluetooth Low Energy 5.4 to transmit weight data instantly to a paired device.
-
Why you need it: You can pair the Umbra Duo with a Lunar, a Pearl, or a smartphone. When you place your portafilter or cups on the Duo, the weight appears seamlessly on your secondary device. This allows for a unified data setup where one screen manages your entire station, keeping your workspace looking clean, sleek, and uncluttered.
2. Acaia ReacX™ Industrial Precision
Hidden beneath the matte black anodised aluminium is the new Acaia ReacX™ weighing technology. This is the most advanced sensor suite Acaia has ever produced, offering unmatched accuracy and repeatability.
-
Why you need it: ReacX technology offers industrial-grade performance with nearly zero latency. In a commercial environment where consistency is king, the Umbra Duo ensures the weight you see is the absolute truth, stabilising faster than almost any other scale on the market to reflect the real weight with minimal error.
3. The Expanded Double-Platform
Compared to the standard Lunar, the Umbra Duo features a double-sized weighing pan.
-
Why you need it: This expanded platform (210 mm in length) meets multiple commercial needs. It is the ideal size for dosing directly into a portafilter or for brewing two cappuccino cups at once on an espresso machine. It provides the extra room needed to dial in perfection without the risk of cups sliding off the edge.
4. Sustainable, Ultra-Efficient Performance
By removing the power-hungry LED display, the Umbra Duo drastically reduces its energy footprint.
-
Why you need it: The Duo offers a remarkable battery life of 40–48 hours of continuous use. For a busy cafe, this means fewer charging cycles and a significantly longer overall lifespan for the internal lithium-ion battery, making it an environmentally friendly choice that promotes sustainability.
5. Boundless Connectivity & Durability
Milled from anodised aluminium, the Umbra series provides enhanced stability for demanding commercial settings. Because it lacks a display window, it is more rugged and easier to maintain.
-
Why you need it: Through Acaia's apps, you can customise every parameter of your workflow. Whether you are monitoring split shots or managing high-volume service, the Duo provides unparalleled flexibility. It connects effortlessly to the latest Acaia ecosystem, ensuring your coffee bar remains at the cutting edge of brewing technology.
The Acaia Umbra Duo is for the barista who needs the data of a laboratory with the workspace of a professional kitchen. It eliminates the visual noise of blinking screens and the physical limitations of small scales, allowing you to focus entirely on the craft. It is a rugged, ultra-precise, and environmentally conscious tool that proves that an expanded platform leads to a more efficient workflow.
Pro Tip: For high-volume bars, pair the Umbra Duo with an Acaia Lunar sitting on the machine. Use the Duo on the bench for portafilter dosing; the Lunar can show your dose weight via Magic Relay, allowing you to dose and pull shots with a single, unified data point.
Acaia Espresso Scales: Choosing Between the Lunar 2021, Umbra, and Brew-by-Weight
When it comes to high-end espresso preparation, Acaia has evolved from a single iconic scale into a sophisticated ecosystem of specialized tools. Understanding the differences between the Lunar 2021, the Umbra Lunar, and the La Marzocco Brew-by-Weight (BbW) scale is key to choosing the right workflow for your bar.
1. Acaia Lunar 2021: The All-Rounder
The Lunar 2021 is the definitive standalone espresso scale. It is designed for baristas who want all their data—weight, time, and flow rate—contained in one robust, visible unit.
-
Key Feature: The Real-Time Flow-Rate Indicator. This LED bar allows you to see exactly how many grams per second are hitting the cup, helping you spot channeling instantly.
-
Best For: Enthusiasts and professionals who need a versatile scale that works on any machine and offers immediate visual feedback.
-
Hardware: USB-C charging, 30–40 hour battery life, and high-visibility LED display.
2. Acaia Umbra Lunar: The Minimalist
The Umbra is a radical departure from traditional design. It has no built-in display, appearing as a sleek, solid block of anodised aluminium. It is designed to be "felt but not seen."
-
Key Feature: Magic Relay technology. Instead of showing weight on its own body, it wirelessly beams the data to a paired Acaia Pearl S or a smartphone.
-
Best For: Minimalist coffee bars or "no-screen" drip trays. It is also more energy-efficient and durable because it lacks the fragile glass/LED window of a traditional scale.
-
Workflow: Typically used in a "Dual Display" setup where a Pearl scale on the bench shows the weight being measured by the Umbra on the drip tray.
3. La Marzocco x Acaia: Brew-by-Weight (BbW)
This is not a standalone scale in the traditional sense; it is a connected instrument developed exclusively for the La Marzocco Linea Mini, Micra, and GS3.
-
Key Feature: Machine Integration. Unlike a standard Lunar that just tells you the weight, this scale talks directly to the La Marzocco electronics. When the scale hits your target weight (e.g., 36g), it sends a signal to the machine to automatically stop the shot.
-
Best For: Owners of La Marzocco home machines who want "set and forget" volumetric precision. It includes a "predictive drip algorithm" that accounts for the coffee still in the air after the pump stops.
-
Hardware: Identical in build to the Lunar 2021 but runs exclusive La Marzocco firmware. Note: As of 2024, standard Lunar 2021 scales can be upgraded to BbW firmware via a paid digital license from Acaia.
| Feature | Lunar 2021 | Umbra Lunar | LM Brew-by-Weight |
| Display | On-device LED | None (Requires Relay) | On-device LED |
| Stop-Shot Function | Manual | Manual | Automatic (with LM) |
| Flow-Rate Bar | Yes | Via App/Relay only | Yes |
| Charging | USB-C | USB-C | USB-C |
| Ideal User | General Pro/Home | Minimalist/Connected Bar | La Marzocco Owners |
Which one do you need?
-
Choose the Lunar 2021 if you want the best all-around scale that provides immediate, easy-to-read data for any espresso machine.
-
Choose the Umbra Lunar if you want a clean, "invisible" aesthetic on your machine and already own (or plan to own) an Acaia Pearl to act as your display.
-
Choose the Brew-by-Weight Scale if you own a La Marzocco and want the machine to handle the precision of stopping the shot for you, ensuring every espresso is identical without you watching the clock.
Acaia Umbra Lunar Support
Explore our Acaia Umbra Lunar Support resources to master your new equipment. Here you will find a dedicated library of videos covering essential maintenance tips and step-by-step guides on how to use the product to its full potential.
Discover Operation Modes of Umbra Duo: Dual Weight Display
About Acaia
Founded in 2014, Acaia was born from a simple yet ambitious mission: to merge laboratory-grade technology with beautiful, minimalist design for the specialty coffee community. The company first gained global attention with the successful Kickstarter launch of the Acaia Pearl in 2013, which set a new standard for what a coffee scale could be. Acaia believes that the future of coffee equipment lies in the seamless integration of hardware and software, a philosophy evident in their suite of Bluetooth-connected apps and firmware-upgradeable devices.
Acaia is more than just a manufacturer; it is a brand deeply rooted in quality and community. Every product is hand-built using high-quality components designed to withstand the rigours of a commercial environment while maintaining an aesthetic that elevates any coffee bar. By collaborating with manufacturers and listening to feedback from baristas worldwide, Acaia continues to push the boundaries of extraction control, transforming the ritual of brewing into a precise and repeatable science.
