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The Duo is a single-dose grinder built around two interchangeable sets of 83 mm flat burrs, one tuned for espresso and one for filter methods, sold separately or together. The manufacturer presents it as the direct successor to the Zero, sharing the same aluminium body and real oak trim, but aimed at people who want to optimise grinding for two distinct uses without recalibrating a single burr set every time.
Grind adjustment runs on a continuous, click-free knob (an "infinite stepless dial"), with no numbered steps, which the manufacturer describes as offering precise control over particle size. Stated dimensions are 135x230x355 mm (width x depth x height), rising to 480 mm tall with the lid upright; weight is 5 kg. The tech-spec page lists a grind speed of 1 gram per second and 72 dB of noise while grinding. The UK version uses a G-type plug at 220-240V/50-60Hz; separate US, EU and AUS variants exist at their own local voltages.
The manufacturer uses two different phrasings for the same idea: a bullet point states "Zero retention", while the longer descriptive copy says "virtually no grind is retained" - a residual that is practically, but not literally, nil. Burr material, motor speed in RPM, and hopper capacity in grams are all left unstated, and remain absent from the official spec sheet on the Niche Coffee site.
Highest technical score among the 5 All-purpose grinders between €2,000 and €5,000 machines: 60/100.
How we assign awards →| Parameter | Value | Source |
|---|---|---|
| Machine dimensions | 13.5 × 23 × 35.5 cm (5.3 × 9.1 × 14.0 in) | manufacturer website |
| Weight | 5.0 kg (11.0 lb) | manufacturer website |
| Burr type | Flat | Declared by the brand |
| Burr diameter | 83 mm | Declared by the brand |
| Retention | 0 g | Declared by the brand |
| Single dose | Yes | Declared by the brand |
| Supported brew methods | Espresso, Drip filter | Declared by the brand |
| Adjustment type | Stepless | Declared by the brand |
| Drive | Electric | Declared by the brand |
Chosen from the brew methods the manufacturer declares it covers, not from the category.
Seven grams, twenty-five seconds, twenty-five millilitres: Italian espresso has a written specification, and this is it.
The same dose as an espresso, less water in the cup. No institutional source fixes its volume — so here you will only find what is documented.
25 ml of espresso and 100 ml of steamed milk, in a 150–160 ml cup. The cappuccino has a specification too.
An espresso and a stain of milk. How much milk, exactly? No source declares it — and we do not invent it.
An espresso lengthened with hot water. The amount of water is set by no standard: it changes from country to country and from bar to bar.
Double espresso, sugar syrup and ice in a shaker. It has no specification: it has a house recipe.
Scelte dalla fascia d'uso e dall'ingombro dichiarati, non dal prezzo: i prezzi non li pubblichiamo.
Simpler, entry level
More compact
Same tier, different manufacturer
