Contents
  1. Specifications
  2. What independent testing found
  3. Strengths and limitations
  4. Complete setup
  5. Alternatives
  6. Our recommendation

Quick verdict

The J-Ultra is the espresso specialist among the hand grinders here. 1Zpresso lists 8 microns per click on an external dial, and CoffeeGeek's first look pulled a textbook 18.5 g in, 45 g out shot in 35 seconds. It costs no counter space and needs no outlet. The trade-offs are about 45 seconds of cranking per espresso dose and slightly less clean pour-over than its K-Ultra sibling in the same reviewer's blind tests.

Buy it if

  • You make espresso on a lever or small machine and want very fine adjustment.
  • You have no room for an electric grinder.

Skip it if

  • You mostly brew pour-over; the K-Ultra or X-Ultra is aimed there.
  • Hand grinding 45 seconds per shot is too much work.
Countertop Coffee editorial score8.5/10
Best for
Manual espresso and lever setups that need very fine adjustment.
Main compromise
Espresso-first; CoffeeGeek found the folding handle awkward and the K-Ultra slightly cleaner for pour-over.
Burrs
48 mm coated conical (espresso-optimized)
Adjustment
External dial, 8 µm per click
Capacity
35–40 g

Specifications

1Zpresso J-Ultra specifications and where each figure comes from
SpecDetail and source
Burrs48 mm coated conical (espresso-optimized)Manufacturer: 1Zpresso, 1Zpresso
AdjustmentExternal dial, 8 µm per clickManufacturer: 1Zpresso
Capacity35–40 gManufacturer: 1Zpresso
Weight700 g on the product page; 670 g on the overview page; 684 g measured by CoffeeGeekSources disagree: 1Zpresso, 1Zpresso, CoffeeGeek
Dimensions19 × 18.5 × 5.5 cmManufacturer: 1Zpresso
IncludedBrush, blower, carrying caseManufacturer: 1Zpresso
Warranty1-year limitedManufacturer: 1Zpresso

1Zpresso's two pages list 700 g and 670 g. CoffeeGeek weighed its sample at 684 g. We show all three.

What independent testing found

Mark Prince's CoffeeGeek first look (June 27, 2024) is hands-on (CoffeeGeek). In his setup:

  • Espresso: 18.5 g in, 45 g out in 35 seconds, including a 10-second preinfusion.
  • Blind comparisons: it beat the Baratza Encore ESP and matched an electric Lagom Mini on two of three pulls.
  • Grind times: about 45 seconds for 18.5 g of espresso, about 30 seconds for 21 g of pour-over.
  • Settings: espresso near 100 clicks and pour-over near 270 clicks from zero, with his beans.
  • Criticism: the folding handle was awkward to collapse.

Strengths and limitations

What stands out

  • 8 µm per click gives very fine espresso control (1Zpresso).
  • Strong hands-on espresso results in the review above.
  • No counter footprint and no power.

Limitations

  • Cranking time, about 45 s per espresso dose.
  • Espresso-first. Pour-over works, but the K-Ultra did slightly better in the same reviewer's comparisons.
  • 1-year limited warranty.

Complete setup

Alternatives

All six hand grinders are compared in hand grinders for espresso.

Our recommendation

I'd pick the J-Ultra for a hand-ground espresso setup where adjustment precision matters most. Mixed pour-over and espresso users should look at the K-Ultra or X-Ultra.

Check price on Amazon

Amazon listing: J-Ultra, iron gray

Sources

  1. J-Ultra Manual Coffee Grinder — 1Zpresso. Manufacturer. Accessed September 26, 2026.
  2. J-Ultra overview page — 1Zpresso. Manufacturer. Accessed September 26, 2026.
  3. 1Zpresso J-Ultra Manual Grinder first look — CoffeeGeek. Independent review. Mark Prince, 2024-06-27. Accessed September 26, 2026.