1Zpresso JX-Pro grind settings.
A hand grinder with an external numbered dial and 12.5 µm per click — fine enough resolution that filter dial-in stops being guesswork.
The chart
Starting points, not targets. Each number carries a ± 1-click band because that is the honest resolution of this dial — land inside the band, then let taste move you.
| Brew method | JX-Pro clicks |
|---|---|
| Espresso anchor | 22 ± 1 |
| Moka pot | 32 ± 1 |
| AeroPress (short, fine) | 37 ± 1 |
| V60 / pour-over | 46 ± 1 |
| Kalita Wave | 51 ± 1 |
| Chemex / batch drip | 56 ± 1 |
| Clever / switch immersion | 66 ± 1 |
| French press anchor | 85 ± 1 |
| Cold brew | 95 ± 1 |
One click on this grinder moves the grind by about 0.10 of a point on the 1–10 universal scale — so roughly 5 clicks is the smallest change worth making between brews.
A chart gets you a starting number and then stops. Coffee Aeye quotes every recipe in JX-Pro clicks to begin with — and when you rate the brew, it tells you which way to move and how many, on this dial.
€4.29 on Google PlayWhere these numbers come from
Two anchors, and interpolation between them. Espresso and French press are the only two bands that manufacturers and community charts actually document with any consistency, so those are the fixed points: espresso at 22 and French press at 85. Everything between is a straight line drawn through them, quantised to the click this dial actually resolves.
Absolute accuracy is not possible and this page will not claim it. Burr wear, per-unit zero points and assembly tolerances all shift where a number lands. What the two-anchor method gives you is the right shape — correct spacing between methods, correct direction of travel — which is what you need to dial in efficiently. The rest comes from calibration.
How this grinder works
Adjustment is an external ring at the base with a numbered scale, so you can read your setting without disassembly — a real advantage over the under-burr knob on most hand grinders. One click is roughly 12.5 µm of burr gap. Zero is burr contact.
Calibrating the chart to your own JX-Pro
If the chart runs consistently coarse or fine for you, do not nudge every row. Re-anchor it:
- Find your espresso mark — the click where a 1:2 shot in about 28 seconds actually happens on your machine. If you do not pull espresso, use the finest point where a moka pot does not choke.
- Find your French press mark — coarse enough that a four-minute steep is clean rather than muddy, and the plunger does not fight you.
- Enter both in Coffee Aeye. Replacing the two anchors corrects the zero point and the slope at once, and every method in between re-derives from your own two numbers.
This matters more on some grinders than others — it matters most anywhere the dial is stepless or the zero is set by hand.
Known quirks of the JX-Pro
12.5 µm per click means clicks are small.
The numbers on this chart look large next to a Comandante's because each one does less. Do not scale a C40 setting onto a JX-Pro by eye — 20 clicks here is nothing like 20 clicks there.
Do not carry settings to a J-Max.
The J-Max S runs 8.8 µm per click. Same brand, same burr size, entirely different chart. This is the single most common cross-grinder mistake in this range.
External dial makes repeatability easy.
Because you can read the setting without pulling the grinder apart, logging exact numbers per bag is realistic here in a way it is not on an under-burr adjuster.
Moving the dial when a brew tastes wrong
The chart gets you into the right neighbourhood. Taste gets you the rest of the way, and the rule is the same on every grinder here:
| What you taste | What it means | Move |
|---|---|---|
| Sour, sharp, thin, empty finish | Under-extracted | Finer |
| Bitter, drying, harsh, ashy | Over-extracted | Coarser |
| Balanced but weak | Ratio, not grind | Hold |
| Balanced but overwhelming | Ratio, not grind | Hold |
On this dial, 5–10 clicks is one meaningful step. Change one thing per brew. The full method is in the V60 dial-in guide.
Coffee Aeye holds this chart for all 18 supported grinders and closes the loop on it. Rate a brew and it converts the fault you tasted into a concrete move — how many clicks on your JX-Pro, in your own dial numbers, not a vague "grind finer". Calibrate your two anchors once and every recipe in the app re-derives to your unit. Get it on Google Play — €4.29, one-time.
Convert a setting to another grinder
Settings do not transfer between grinders — click sizes, burr geometry and zero points all differ. The grinder converter maps a JX-Pro setting onto any of the other 17 through the same universal scale this chart is built on.