Eureka Mignon LIBRA 55 — Grind-by-Weight Espresso Grinder, 55mm Flat Burrs, Direct Drive

For the home barista who wants a precise dose every time, without the extra steps

The Eureka Mignon LIBRA 55 is a grind-by-weight coffee grinder with 55mm flat hardened steel burrs and a 310W direct drive motor. It weighs each dose to the gram and stops grinding automatically — no timer, no external scale.

What sets it apart

Instant Grind Weighing (IGW) technology integrates the scale directly into the grinding circuit, achieving ±0.2g consistency shot after shot — precision that's difficult to replicate manually. The ACE System (Anti-Clumps & Electrostaticity) minimizes clumping and static charge, so grounds fall cleanly into the portafilter without sticking to the walls. In the grind-by-weight grinder segment priced between $900 and $1,300 CAD, the LIBRA 55 is among the few to deliver this level of dosing precision in the compact Mignon footprint.

Key specifications

• 55mm flat hardened steel burrs — geometry optimized for espresso, proven long-term durability.
• Direct drive motor, 1,350 RPM — 310W — no belt transmission, reduced vibration, lower maintenance.
• IGW technology — ±0.2g precision — the integrated scale stops grinding at the exact programmed weight, every time.
• ACE System — anti-clumps and anti-static: grounds fall cleanly with no clumping and minimal retention.
• Espresso productivity: 1.8–2.5 g/s — an 18g dose produced in 7 to 10 seconds.
• Silent Technology — ≈ 64 dB — approximately 20 dB quieter than conventional grinders; suitable for early mornings in shared spaces.
• Adjustable fork: 51–58mm portafilters — compatible with the vast majority of semi-automatic espresso machines.
• Stepless micrometric adjustment — Eureka-patented continuous and progressive grind size setting, no predefined steps.
• 300g hopper — sufficient for several consecutive sessions. 510g option available.
• Touchscreen display — 2 programmable doses + continuous mode — save two distinct target weights (e.g., 9g single dose and 18g double).
• Dimensions: 124 W × 192 D × 390 H mm — Weight: 6.5 kg — compact footprint, stable on the counter.
• Standard 15-amp outlet (120V / 60Hz). ETL certified for the North American market.

Daily use

Set your target dose in grams — once, and you're done. Press the button: the grinder doses and stops precisely at the programmed weight. No timer to calibrate, no external scale to pull out. Continuous mode stays available for dialing in or experimenting. Maintenance is limited to brushing the burrs every few weeks and occasionally re-calibrating the scale. The fork removes without tools for cleaning.

Ideal for / Not ideal for

Ideal for:

• The intermediate-to-advanced home barista who wants a precise dose every extraction without handling an external scale.
• Those preparing 1 to 4 espressos per day who value automatic consistency over manual variable control.
• Users of semi-automatic machines — including ECM, Lelit, Rancilio, and La Marzocco models available at L'Heureux — looking for a grinder that matches their equipment's capability.

Not ideal for:

• Those who prefer manual dosing and full control over every variable — check out the Mignon Zero at lheureuxinc.com.
• Commercial establishments or high-volume use — explore the Eureka Atom W lineup at lheureuxinc.com.
• Filter coffee enthusiasts grinding large batches — the LIBRA 55 is optimized for espresso (see the LIBRA BREW for filter).

Category positioning

In the grind-by-weight espresso grinder segment priced between $900 and $1,300 CAD, the Eureka Mignon LIBRA 55 delivers Instant Grind Weighing at ±0.2g precision in the compact Mignon format — dosing accuracy typically found only in commercial-grade grinders at a higher price point. Its Silent Technology and ACE System also make it one of the quietest and cleanest-running grinders in its class.

Compatible with

Works with 51–58mm portafilters. Pairs naturally with ECM, Lelit, Rancilio, Rocket, and La Marzocco semi-automatic machines available at lheureuxinc.com. For a no-compromise home espresso setup, pairing the LIBRA 55 with a dual boiler machine like the Lelit Bianca or ECM Synchronika is a reference configuration in this price range.