OPEN BOX Eureka Mignon Libra 55mm Coffee Grinder Black
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OPEN-BOX CONDITION: This is a customer-return unit that may show light evidence of prior use. It has been cleaned and inspected and includes the full applicable warranty.
Limited availability: Open-box inventory is limited. Select the available finish above before ordering.
Open-Box Eureka Mignon Libra 55: Condition and Value
This listing offers the same core grinder performance described below at an open-box price. Packaging may show handling, and the grinder may have minor cosmetic evidence of setup or brief use. Espresso Outlet inspects and cleans the unit before resale.
Prefer an unused unit? View the new Eureka Mignon Libra 55.
Eureka Mignon Libra 55mm Grind-by-Weight Espresso Grinder
The Eureka Mignon Libra 55 combines a compact Mignon body with an integrated scale that grinds directly into the portafilter and stops at the programmed gram target. Its 55mm flat hardened-steel burrs, touchscreen, stepless adjustment, ACE system and Silent Technology create a fast, repeatable espresso workflow without a separate dosing scale.
Think of the Libra 55 as the grind-by-weight counterpart to the Specialita 55. Both use 55mm burrs, but the Specialita stops by time while the Libra measures the grounds. The Libra 65 AP adds larger all-purpose burrs and a more trackable adjustment dial.
Why Choose Eureka Mignon Libra 55?
- Instant Grind Weighing: Stops at a programmed gram target rather than elapsed time.
- 55mm flat hardened-steel burrs: Espresso-focused consistency and body.
- Touchscreen controls: Program two weight targets or use continuous mode.
- Approximate ±0.2g consistency: Designed for repeatable hands-free dosing under proper setup.
- Stepless adjustment: Fine control for espresso dialing.
- Silent Technology: Reduces vibration and operating noise.
- ACE system: Helps control clumps and static.
Who Is It Best For?
Choose the Libra 55 if you make espresso from one primary hopper coffee and want the grinder to weigh each dose automatically.
It is less ideal for single dosing, changing beans every shot, or moving frequently between espresso and filter. Choose the Zero 55 for single dosing or the Libra 65 AP for broader brew use.
Eureka Libra 55 vs Libra 65 AP vs Specialita
The Libra 55 is the compact espresso-focused grind-by-weight model. The Libra 65 AP adds larger all-purpose burrs and easier setting tracking; Specialita uses timed dosing instead of a scale.
| Model | Burrs | Dosing workflow | Best for | Main reason to choose it |
|---|---|---|---|---|
| Eureka Mignon Silenzio 50 | 50mm flat steel | Manual or analog timed dosing | Quiet, straightforward home espresso | The simplest and most affordable hopper-fed Mignon in this collection |
| Eureka Mignon Zero 55 | 55mm flat steel | Single dose with bellows and cup | Changing coffees and weighing each dose | Purpose-built low-retention single-dose workflow |
| Eureka Mignon Specialita 55 | 55mm flat steel | Two timed doses + continuous | Daily hopper-fed espresso | Touchscreen convenience and repeatable timed dosing |
| Eureka Mignon Libra 55 | 55mm flat steel | Grind by weight | Hands-free espresso dosing | Stops at a programmed gram target rather than time |
| Eureka Mignon Libra 65 AP | 65mm flat steel, all-purpose geometry | Grind by weight | Espresso and filter from one grinder | Larger burrs, built-in scale and easier setting changes |
| Eureka Atom 75 | 75mm flat steel | Electronic timed dosing | High-volume espresso | Faster commercial-style output without grind-by-weight |
| Eureka Atom W 75 | 75mm flat steel | Grind by weight | High-volume, weight-based espresso | Atom speed plus an integrated weighing system |
Libra 55 vs Libra 65 AP
The Libra 65 AP uses 65mm all-purpose burrs, a 0–20 King-Size dial and revolution counter for easier movement between brew methods. The Libra 55 is smaller, espresso-focused and the better value when filter grinding is not a priority.
Libra 55 vs Specialita 55
The burr size is similar, but dosing is different: Libra weighs grounds, while Specialita estimates dose from grind time. Libra is more adaptive as coffee density changes; Specialita costs less and has a simpler fork.
How Grind-by-Weight Dosing Works
Set a target weight on the touchscreen, place a compatible portafilter securely on the fork, and start grinding. The integrated system measures grounds during dispensing and stops at the target. Correct fork height, a stable portafilter and the appropriate dosing funnel are important for accuracy.
Stepless Micrometric Grind Adjustment
The fine-threaded dial is optimized for espresso corrections. Like other classic Mignons, it is excellent within a narrow range but less convenient for large daily changes between espresso and filter.
55mm Burrs, Silent Technology and ACE
The 55mm burrs produce consistent espresso grounds, while the damped metal body keeps noise controlled. ACE reduces clumps and static so the scale and portafilter receive a cleaner stream of grounds.
Eureka Mignon Libra 55 Specifications
| Recommended use | Grind-by-weight espresso |
|---|---|
| Burrs | 55mm flat hardened steel |
| Adjustment | Stepless micrometric |
| Dosing | Two weight presets + continuous |
| Dose consistency | Approximately ±0.2 g under proper setup |
| Output | Approximately 1.4–1.8 g/s espresso |
| Motor | 1350 RPM, 310 W |
| Hopper | 300 g |
| Dimensions | 4.88 in W × 7.56 in D × 15.25 in H |
| Weight | 12.34 lb |
| Electrical | 110–120V, 60Hz U.S. version |
Specifications apply to this U.S.-market listing and may differ from similarly named international revisions.
Setup and Care
- Level and stabilize the grinder before calibrating.
- Adjust the fork so the portafilter sits securely without touching surrounding surfaces.
- Run the motor while adjusting finer.
- Keep the weighing platform free of loose grounds.
- Recalibrate if dose behavior becomes consistently inaccurate.
- Unplug before internal cleaning.
What Comes in the Box?
- Eureka Mignon Libra 55 grinder in black
- 300g hopper with lid
- Adjustable grind-by-weight portafilter fork
- Grounds tray
- Product documentation
Included accessories can change by production run. Contact Espresso Outlet before ordering if a particular accessory is essential.
Frequently Asked Questions
Is the Eureka Libra 55 good for espresso?
Yes. It is an espresso-focused grind-by-weight grinder with 55mm flat burrs and fine stepless adjustment.
How accurate is the Libra 55?
Eureka specifies dose consistency around ±0.2g under proper setup. Portafilter stability, fork position, static and calibration affect results.
Does the Libra 55 require a dosing funnel?
A compatible funnel is strongly recommended because it keeps grounds in the basket and helps the portafilter remain stable during weighing.
Can the Libra weigh a dosing cup?
It is designed primarily around a supported portafilter. Cup compatibility depends on dimensions and stable fork placement; the Libra 65 AP has a more versatile fork for portafilters and all-purpose cups.
What happens if I touch the portafilter while grinding?
Touching or supporting it changes the force measured by the scale and can affect the final dose. Let the portafilter rest freely on the adjusted fork.
Can Eureka Mignon Libra 55 grind for pour-over or drip coffee?
It can grind coarser, but the espresso burrs and small dial make frequent switching less convenient. The Libra 65 AP was specifically designed for espresso and filter use.
How much coffee does Eureka Mignon Libra 55 retain?
Retention is low for a compact hopper grinder but not zero. Purge after large grind changes or switching coffees, and clean the chute periodically.
Does Eureka Mignon Libra 55 require RDT?
Do not use RDT with beans stored in the hopper. Added moisture can affect the hopper and weighing workflow; ACE is intended to control static.
How quiet is Eureka Mignon Libra 55?
Silent Technology makes it quieter than many grinders with similar performance, although burr load and coffee type affect sound.
Can SSP burrs be installed?
It is a 55mm platform, not the common 64mm SSP format. Use only replacement burrs confirmed for this exact Libra model.
Will cleaning erase the grind setting?
Routine upper-burr access generally preserves the lower-burr adjustment. Mark the dial before service, unplug the grinder, and follow the manual whenever opening the burr chamber.
Should the grinder run while adjusting finer?
Yes. Run the motor while moving finer so beans are less likely to become compressed between the burrs. Make small changes and purge a little coffee before evaluating the next extraction.
Is this the 120V U.S. version?
Yes. This listing is for a 110–120V, 60Hz U.S.-market grinder. Do not use it on a 220–240V electrical system without the correct manufacturer-specified version.
Where is Eureka Mignon Libra 55 made?
Eureka manufactures this grinder in Florence, Italy.
Does Espresso Outlet provide support and warranty service?
Espresso Outlet supports the products it sells and can help with setup, parts, and service questions. Warranty coverage follows the applicable U.S. terms for this listing; contact us with an order number for a specific claim.
Open-Box Questions
What does open box mean?
This unit was previously shipped to or used briefly by a customer and returned. It is not represented as factory-sealed new merchandise.
Has the grinder been inspected?
Yes. Espresso Outlet cleans and inspects the unit before resale. Cosmetic condition and packaging may differ from a factory-sealed product.
Does the open-box grinder include a warranty?
Yes. This listing includes the full applicable warranty stated for the product. Contact Espresso Outlet with the order number if service is needed.
Are all accessories included?
The essential operating accessories are included unless the listing states otherwise. Packaging or minor nonessential materials may differ; contact us before ordering if a particular accessory is required.
Shop More Eureka Grinders
Still deciding? Browse the complete Eureka grinder collection or use the comparison above to select the dosing workflow and burr size that fit your coffee routine.
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