☕ GRINDER REVIEW

1Zpresso J-Ultra Review (2026)

1Zpresso

Reviewed & approved by Juhi Sahni, Senior Editor

By CoffeeLabAdvisor Editorial TeamPublished: Updated: Editorial standards

The 1Zpresso J-Ultra is a hand grinder designed first for espresso. It pairs a 48mm conical burr with a coating that 1Zpresso says improves sweetness and speed, and an external numbered dial that moves the burr 8 microns per click, the finest step in 1Zpresso's range. Capacity is 35 to 40 grams, enough for a double shot or a two-cup pour-over, and the grinder folds its handle and travels in a hard case. Hands-on reviewers have been unusually consistent about it: CoffeeGeek pulled one of the best shots it has had from its test blend and rated it ahead of an electric conical grinder on espresso taste, and Tom's Guide measured almost no retained coffee. The trade-offs are the ones every hand grinder carries, plus a few of its own: a lot of clicks between brew methods, a top-heavy body, and the work of cranking every dose by hand.

CoffeeLabAdvisor evaluation · Independently evaluated

Best suited for

  • Espresso drinkers who want precise dial-in from a hand grinder from our review
  • travel, camping and a counter without a power outlet — it is a hand grinder from the specification

Consider another option if

  • you grind for espresso several times a day — hand-grinding espresso doses is slow from the specification
Read our evaluation →

How CoffeeLabAdvisor knows what it knows · Ask the Advisor

An espresso-first hand grinder with 48mm coated conical burrs, 8-micron steps on an external numbered dial and very low retention. Reviewers rate its espresso highly; switching to filter means well over a hundred clicks, and every dose is cranked by hand.
Best for: Espresso drinkers who want precise dial-in from a hand grinder
Burrs
Coated stainless steel
Burr size
48
Dosing
Manual
Weight
0.684 kg

Grind Quality for Espresso

Espresso is where the J-Ultra earns its reputation. CoffeeGeek, testing a unit 1Zpresso supplied, started at 1Zpresso's suggested espresso range, made two adjustments and pulled a shot of 18.5 grams in, 45 grams out in 35 seconds on a Breville Dual Boiler, which it described as a near-perfect example of its test blend. In three blind side-by-side tastings against 1Zpresso's own K-Ultra, CoffeeGeek preferred the J-Ultra's shot each time, and against the electric Lagom Mini it preferred the J-Ultra in two of three espresso tastings. Tom's Guide sifted the J-Ultra's grounds through Kruve sieves and found very even particle sizes, with one modest outlier at a medium setting, and saw minimal clumping. Home Coffee Expert pulled good espresso from a medium roast at the setting it recorded. The burr behind those results is a 48mm heptagonal design with a dark coating that CoffeeGeek identifies as titanium, cut specifically for fine grinding. CoffeeGeek also reached Turkish-coffee powder, though cranking at that setting was hard work.

Adjustment: 8 Microns a Click, 500 Clicks in All

The J-Ultra's dial sits on the outside of the body below the lid, numbered 0 to 9 with ten clicks between numbers. CoffeeGeek counts 100 clicks per full turn and five turns in total, so the grinder spans about 500 settings, each moving the burr 8 microns. Because the dial rises and falls as it turns, a small pyramid of dots on the body shows which rotation you are on, which CoffeeGeek singled out as the cleverest part of the design. For espresso this resolution is the point: a single click is a small, predictable change in shot time, and CoffeeGeek found the J-Ultra's dial far more consistent than the Baratza Encore ESP's when dialling in. The cost is distance. Espresso begins around one full turn from zero and pour-over around two and a half, so Home Coffee Expert found switching between methods cumbersome, and it notes that you should check the zero point after every cleaning. Tom's Guide found the external ring much easier to use than the Comandante C40's dial under the burrs.

Filter Coffee, and the Limits of an Espresso Burr

The J-Ultra will grind for every method, and its reviewers used it for pour-over and French press without trouble, but its burr is tuned for the fine end. CoffeeGeek found its pour-over cups very good and quick to grind, about 30 seconds for 21 grams, yet in blind tests the K-Ultra made a slightly cleaner, more balanced V60 and the Lagom Mini won all three pour-over tastings, and CoffeeGeek attributed the gap to slightly more fines from the J-Ultra at that setting. Home Coffee Expert, by contrast, found the J-Ultra consistent right through to French press and was happy with a four-minute press brew. Tom's Guide listed its one real weakness as being less versatile than other grinders. The practical reading is straightforward. If you mostly make espresso and brew filter coffee now and then, the J-Ultra covers both well. If filter coffee is most of what you drink, 1Zpresso's K-Ultra or a brew-focused grinder will serve you slightly better for the same effort, and its larger click steps make moving between methods quicker.

Build, Workflow and Daily Use

Apart from the plastic lid, silicone grip and wooden knob, the J-Ultra is metal, and CoffeeGeek weighed it at 684 grams, between the two figures 1Zpresso publishes. Its catch cup holds on with magnets, and the body bulges above the cup so your gripping hand is less likely to knock it loose, a design change CoffeeGeek credits to user feedback on earlier models. The crank folds down for storage; CoffeeGeek found the fold mechanism fiddly, with an awkward halfway click, while Tom's Guide found the grinder top heavy enough to fall over on anything but a stable surface. Grinding is quick for a hand grinder: CoffeeGeek ground an 18.5-gram espresso dose in about 45 seconds, and Tom's Guide could turn the crank easily even at the finest setting. Home Coffee Expert's tester with smaller hands still struggled at fine settings, as she would with most hand grinders. Everything comes apart without tools, 1Zpresso includes a brush and blower, and the burrs must be kept dry. Tom's Guide measured very little retained coffee, and none at all in its first weighing test.

Who It's For and Value

The J-Ultra suits someone who makes espresso most days, wants fine control when dialling in, and is happy to grind each dose by hand, whether to save counter space, to travel, or to get espresso-grade grinding without buying a large electric grinder. CoffeeGeek concluded that as an espresso grinder it did not think the J-Ultra had an equal in the market, and Home Coffee Expert and Tom's Guide both named it their pick among hand grinders. It is less suited to households that switch between espresso and filter every day, because of the 140 or so clicks in between, or to anyone who finds hand cranking hard, since a double dose is still around three quarters of a minute of work. If you mainly brew filter coffee, its sibling the K-Ultra is the more natural choice. 1Zpresso gives a one-year limited warranty covering defects in materials and workmanship, and both 1Zpresso and our reviewers warn against getting the grinder or its burrs wet, so plan on brushing it clean. Check the current listing before buying, since 1Zpresso sells it in more than one colour.

What This Review Is Based On

This review is a synthesis of published evidence, not a test of our own unit. Specifications come from 1Zpresso's J-Ultra product page and its store listing, and from the Amazon listing sold by 1Zpresso, all read on 28 October 2026. 1Zpresso gives two weights, 670 and 700 grams, so we use CoffeeGeek's measured 684 grams. Hands-on evidence comes from CoffeeGeek's First Look, Tom's Guide's review by Erin Bashford, and Home Coffee Expert's review. 1Zpresso supplied the unit CoffeeGeek tested, along with the K-Ultra and X-Ultra it compared; Tom's Guide and Home Coffee Expert do not say how they obtained theirs. CoffeeGeek's piece is a first look, not a scored review, and Home Coffee Expert describes about a week of use, so no source we found reports long-term durability. The 100-clicks-per-turn figure is CoffeeGeek's description of the dial rather than a 1Zpresso specification. We found no safety recall for 1Zpresso grinders in the US Consumer Product Safety Commission recall database, checked in October 2026.
1Zpresso J-Ultra $199.00 on Amazon
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1Zpresso J-Ultra — FAQ

Is the 1Zpresso J-Ultra good for espresso?

Yes, that is what it is built for. CoffeeGeek pulled a near-perfect shot after two adjustments and preferred its espresso to an electric Lagom Mini in two of three blind tastings. Its 8-micron steps let you make small, predictable changes to shot time. The catch is effort: each double dose is about 45 seconds of hand grinding, which suits one or two drinks a day better than a busy household.

1Zpresso J-Ultra vs Comandante C40: which should I buy?

For espresso, the J-Ultra. Home Coffee Expert tested both and would save money and buy the J-Ultra, citing its numbered external dial and finer steps. Tom's Guide measured lower retention on the J-Ultra and found it easier to crank. Home Coffee Expert thought the Comandante's pour-over cup was perhaps slightly better, and Tom's Guide saw less static from it, so a filter-first drinker might still prefer the Comandante.

1Zpresso J-Ultra vs K-Ultra: what is the difference?

The J-Ultra has an espresso-tuned coated burr and 8-micron clicks; the K-Ultra uses a different burr and larger steps of about 20 microns, per Home Coffee Expert. CoffeeGeek preferred the J-Ultra's espresso in three blind tastings but found the K-Ultra's V60 slightly cleaner. Choose the J-Ultra if espresso is most of what you make, and the K-Ultra if you mostly brew filter coffee.

Can the 1Zpresso J-Ultra grind for pour-over and French press?

Yes. Its dial runs from Turkish powder to French press over about 500 clicks, and Home Coffee Expert brewed good pour-over and French press with it. CoffeeGeek found its pour-over very good but slightly behind the K-Ultra's, with a few more fines. Expect to turn the dial a long way between espresso and pour-over, about 140 clicks by CoffeeGeek's count, so it suits people who settle on one method.

How do you clean and recalibrate the J-Ultra?

It comes apart by hand without tools. Turn the dial a full rotation from zero, push up on the inner burr, unscrew the top nut, and slide the shaft out, as CoffeeGeek describes. Brush the burrs and use the included blower, but never wash them with water. Home Coffee Expert advises checking afterwards that the dial reads zero when the burrs touch, and recalibrating using the manual if it does not.

What warranty does the 1Zpresso J-Ultra have?

1Zpresso states that all its grinders carry a one-year limited warranty against defects in materials and workmanship, and the Amazon listing sold by 1Zpresso repeats that one-year term. Getting the burrs wet or other misuse is unlikely to be covered, so follow the dry-cleaning advice. 1Zpresso says the burrs are calibrated at the factory; Home Coffee Expert's unit arrived calibrated, though it had heard of some arriving slightly off.

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