1Zpresso J-Max vs JX-Pro vs K-Max: Which One Should You Buy?
Same 48 mm burrs, three very different adjustment systems. The right one depends entirely on whether you make espresso.
Tomas Reyes
August 9, 2026
5 min
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1Zpresso's naming is genuinely confusing — J, JX, K, Max, Pro, Plus — and the spec sheets lead with burr diameter, which in this case tells you almost nothing. The J-Max, JX-Pro and K-Max all run 48 mm conical burrs. What separates them is the adjustment mechanism: how finely you can step the grind, and how far you have to turn to get from espresso to filter. That's the spec that decides which one you'll be happy with in a year.
The numbers that matter
- J-Max — 8.8 microns per click, 90 clicks per rotation, titanium-coated burrs. The finest adjustment of the three, built around espresso.
- JX-Pro — 12.5 microns per click, 40 clicks per rotation, stainless burrs. Fine enough for espresso, and fast to swing across to pour-over.
- K-Max — 22 microns per click, 90 clicks per rotation, stainless K burrs. The coarsest steps, the most rigid body, the best all-rounder.
- All three — 48 mm conical burrs and an external numbered dial, so a setting you find is a setting you can return to.
The rule that decides it: espresso needs small steps, filter doesn't
Espresso is brutally sensitive to grind size. A change of ten or fifteen microns visibly moves your shot time, so a grinder that steps in 22-micron jumps means the setting you want sometimes sits between two clicks — you're choosing between a shot that runs slightly fast and one that runs slightly slow, forever. At 8.8 microns per click, the J-Max lets you land on it.
Filter coffee doesn't care. A V60 or French press tolerates 30 microns either way without you noticing, so fine adjustment there buys you nothing but extra turning. That inverts the usual buying logic: the fine-stepping J-Max is the specialist, not the flagship, and the coarser-stepping K-Max is the more versatile grinder despite costing more.
So which should you buy?
Espresso is your main drink and you're dialling shots: the J-Max. Its 8.8-micron steps are the reason to own it, and the titanium coating keeps the burrs sharp through years of the hardest grinding a hand grinder does.
Our picks, compared
1Zpresso J-Max Manual Coffee Grinder
The single highest-impact upgrade most home setups can make.
1Zpresso JX-Pro Manual Coffee Grinder
Brewing espresso and pour-over on the same grinder without fighting it.
1Zpresso K-Max Manual Coffee Grinder
One grinder for a household that brews several ways every week.
1Zpresso Q2 Manual Coffee Grinder
The best filter grind you can get under $75.
You make espresso and pour-over on the same grinder and switch between them regularly: the JX-Pro. At 40 clicks per rotation it takes a fraction of a turn to move between brew methods, which sounds trivial until you're doing it twice a day. It's also the cheapest of the three.
One grinder for a household that brews filter, French press and the occasional espresso: the K-Max. Coarser steps, but a stiffer body that flexes less under load and a range that covers everything without complaint.
And if none of this is worth $150–200 yet: the Q2 is the small, cheap 1Zpresso that grinds filter coffee genuinely well. It is not an espresso grinder and doesn't pretend to be, but it will outperform every electric blade grinder and most sub-$100 burr grinders on the market.
- Which 1Zpresso is best for espresso?
- The J-Max. Its 8.8 microns per click is the finest adjustment in the range, which matters because espresso shot time moves visibly with ten to fifteen microns of grind change. The JX-Pro at 12.5 microns is also perfectly usable for espresso; the K-Max's 22-micron steps are coarse enough that you'll sometimes want a setting between two clicks.
- What's the difference between the J-Max and K-Max?
- Both have 48 mm conical burrs. The J-Max uses titanium-coated burrs and steps 8.8 microns per click, built for espresso precision. The K-Max uses stainless K burrs, steps 22 microns per click, and has a heavier, more rigid body — better as a single do-everything grinder for a household brewing several ways.
- Is the JX-Pro good enough for espresso?
- Yes. At 12.5 microns per click it has enough resolution to dial a shot properly, and its 40 clicks per rotation make it much faster than the others to swing between espresso and pour-over. If you brew both regularly on one grinder, it's the most practical of the three — and the cheapest.
- Do all three use the same burrs?
- Same 48 mm conical size, different burr designs and coatings. The J-Max uses a titanium-coated burr set optimised for fine grinding, while the JX-Pro and K-Max use stainless steel burrs. The bigger practical difference between the models is the adjustment step size, not the burrs.
Tomas Reyes
Tomas is a coffee equipment reviewer and former Q-grader. He has tested over 200 home grinders in the last eight years and writes a quarterly buyer's guide.