Skip to main content
BrewMarkBREWMARK
1Zpresso J-Ultra

Buying guide · Hand · Conical burrs

1Zpresso J-Ultra

Buy it if you pull espresso and want the finest-stepped hand grinder 1Zpresso makes; if you mostly brew filter, a filter-leaning burr will serve you better.

Best for
Espresso, Moka pot, AeroPress, Pour-over
List price
About $199
Check price — Amazon →Settings chart →

BrewMark hasn't tested this grinder in person. This guide compiles the maker's specs and published reviews, listed under Sources. As an Amazon Associate, BrewMark earns from qualifying purchases.

In brief

The J-Ultra is 1Zpresso's espresso hand grinder. It pairs a 48 mm coated burr with an external dial that moves 8 microns per click. 1Zpresso calls that "the most precise adjustment among all 1Zpresso models."

It took the place of the J-Max, which 1Zpresso now lists as not available. Home Coffee Expert calls the J-Ultra an upgrade on the J-Max "in every possible area," and made it its best manual grinder pick.

The trade-off is range. Five rotations of fine clicks give great control at the espresso end, but make the trip to coarse settings long.

What it does well

  • 8-micron clicks, the finest 1Zpresso offers, per 1Zpresso
  • Home Coffee Expert found its burrs 'remarkably consistent' at all grind sizes
  • Sigma Coffee says it produces 'the best espresso grinds and a surprisingly good medium-fine'
  • Foldable handle, magnetic catch cup and carry case included, per 1Zpresso

Where it falls short

  • The wide range makes switching between brew methods cumbersome, per Home Coffee Expert
  • Sigma Coffee found coarse grinds less even than on the X-Ultra or J
  • Sigma Coffee says disassembly and recalibration take more care than on simpler grinders
  • Home Coffee Expert notes some units arriving slightly off calibration

Specs

Type
Hand grinder, Conical burrs
Burrs
48 mm conical, coated, built for espresso
Adjustment
External dial, 100 clicks per rotation, 8 microns per click
Range
Five rotations
Capacity
35–40 g
Weight
700 g
Size
19 × 18.5 × 5.5 cm
Warranty
One-year limited (1Zpresso)
Power
Hand, foldable handle

Where to start on the dial

Espresso 127 clicksMoka pot 208 clicksAeroPress 217 clicksPour-over 222 clicks

Every method on the settings chart →
On this page · 5 sections
  1. What it does well
  2. Where it falls short
  3. Who should buy it, and who shouldn't
  4. How it compares
  5. Owning it

What it does well

Espresso control is the point. Each click moves the burr 8 microns, per 1Zpresso's manual, which makes it close to stepless for dialing in. Home Coffee Expert says "the consistency and accuracy are perfect for espresso."

It is not only an espresso grinder. Home Coffee Expert found the burrs "remarkably consistent grinds at all sizes," and used it for light-roast pour-over. Sigma Coffee calls its medium-fine "surprisingly good."

The build earns praise. Home Coffee Expert says "every component is nicely machined and fits together well." Sigma Coffee singles out the dual-bearing axle and the leverage of the solid wood handle.

It travels well. 1Zpresso includes a foldable handle, a magnetic catch cup and a carrying case. The store page lists the grinder at 700 g.

Where it falls short

Moving between methods is slow. Home Coffee Expert lists the wide range as a con, because switching settings is "cumbersome." If you go from espresso to French press daily, you will be turning a lot.

Coarse grinds are good, not best. Sigma Coffee says the X-Ultra or J would be more consistent at coarse settings, with fewer fines. That fits a burr 1Zpresso describes as crafted for espresso.

Cleaning takes care. Sigma Coffee notes disassembly is more involved than on a grinder with standard adjustment, and needs careful recalibration. Home Coffee Expert mentions reports of units arriving slightly off calibration, and warns it is hard work for anyone with limited grip strength.

Who should buy it, and who shouldn't

Buy it if you pull espresso and want fine control from a hand grinder. It also suits moka pot and AeroPress, and the settings chart on this page covers each method.

Skip it if you mostly brew pour-over or French press. A filter-leaning burr will give you a cleaner coarse grind with less turning. Skip it too if grinding by hand every morning sounds like a chore.

How it compares

The 1Zpresso X-Ultra is the cheaper all-rounder, with 12.5-micron steps per 1Zpresso. Sigma Coffee prefers it at coarse settings. See J-Ultra vs X-Ultra.

The Kinu M47 Classic is the stepless espresso hand grinder many buyers shortlist. Home Coffee Expert found it harder to use, no better in consistency, and considerably more expensive. See J-Ultra vs M47 Classic. Home Coffee Expert also notes 1Zpresso's K-Ultra is less precise, at 20 microns a step.

The KINGrinder K6 costs far less and moves 16 microns per click, per KINGrinder. See J-Ultra vs K6. If you own a J-Max already, J-Max vs J-Ultra shows how the dials differ.

Owning it

Keep water away from it. 1Zpresso's manual says to clean with a brush and blower, both included, and not to wash the grinder. Our guide to cleaning a hand grinder covers the routine.

Follow the manual when you strip it down. The shaft, burr, burr ring unit and bearings should not be taken apart further. Re-zero after reassembly; the manual warns the starting point can vary by about 10 clicks, and our calibration guide explains the zero point.

1Zpresso backs its grinders with a one-year limited warranty against defects. Home Coffee Expert expects the coated burrs to "comfortably last you over 10 years of grinding."

Also worth a look

Sources

  1. 1Zpresso: J-Ultra
  2. 1Zpresso: J-Ultra Manual Coffee Grinder (store)
  3. 1Zpresso: J-Ultra user manual
  4. Home Coffee Expert: 1Zpresso J Ultra Review
  5. Sigma Coffee: 1Zpresso J-Ultra review
  6. 1Zpresso: X Series
  7. 1Zpresso: J Series
  8. KINGrinder: Comparison of the KINGrinder models

By Jeff Gluck · Checked 2026-10-21