1Zpresso JX-Pro Grind Settings: Complete Click Guide

3.9.0 on a 1Zpresso JX-Pro for a V60 with a light-roast Ethiopian. 2.9.1 for an AeroPress with a washed Colombian. 5.1.1 for a French Press with a dark roast. Those three numbers tell you more than any "medium-fine" label you'll find.

The JX-Pro is one of the most versatile hand grinders you can buy. 48mm stainless steel conical burrs, top adjustment with a numbered dial, and 40 clicks per turn — enough precision to grind everything from espresso to French Press with a single grinder. It's the range that makes it special: where most hand grinders specialize in either filter or espresso, the JX-Pro covers both comfortably. If you have a Comandante C40, we have a dedicated guide with clicks for every method.

This guide gives you the settings for every method, organized by roast level. These are starting points. Every coffee is different, so you'll want to adjust based on the profile. But a concrete number is always better than a vague description.

Quick Reference Table

Settings use the JX-Pro's Rotation.Number.Tick format (explained below). Starting points are for a light-roast washed coffee. For medium roasts, add 6 clicks (+0.1.2). For dark roasts, add 13 clicks (+0.3.1).

How the Adjustment System Works

The JX-Pro uses a stepped adjustment dial on top of the grinder. 1Zpresso advertises 12.5 microns per click, but that number measures the gap change between the burrs, not the actual change in particle size. Measured empirically, each click shifts the grind by about 5 microns. Still one of the finest resolutions you'll find in a hand grinder.

The Rotation.Number.Tick System

JX-Pro settings are read as three numbers separated by dots: Rotation.Number.Tick.

• Rotation: how many full turns from zero (0, 1, 2, 3...).
• Number: the dial number the indicator points to (0–9). There are 10 per turn.
• Tick: the marks between each number (0–3). There are 4 ticks per number.

Example: 3.9.0 means 3 full turns from zero, number 9, tick 0. In total clicks: 3 × 40 + 9 × 4 + 0 = 156 clicks.

One full turn = 10 numbers × 4 ticks = 40 clicks. To convert any setting to total clicks: (Rotations × 40) + (Number × 4) + Ticks.

To find zero: turn the dial clockwise (viewed from above) until the burrs touch and the handle no longer spins freely. That's your zero. Count up from there by turning counterclockwise to go coarser.

JX-Pro vs JX: The Difference That Matters

The JX-Pro has top adjustment with 40 clicks per turn. The standard JX has bottom adjustment with 30 clicks per turn. More clicks per turn = more control, especially in the espresso range where every click counts. If you have the standard JX, the settings in this guide don't apply directly — the distance between clicks is different.

V60

The V60 is where the JX-Pro shines on filter. Clean grind, well-defined flavors, and enough resolution to dial in between coffees with precision.

• Light roast: 3.9.0 (156 clicks).
• Medium roast: 4.0.2 (162 clicks).
• Dark roast: 4.2.1 (169 clicks).

Target brew time: 2:30 to 3:30 for a 15g dose with 250ml water. If it drains too fast and tastes sour, go 2–4 clicks finer. If it stalls and tastes bitter, go coarser.

AeroPress

The AeroPress accepts a huge grind range, and the JX-Pro has the versatility to cover all of it — from something close to espresso to a smooth drip.

• Standard method: 2.9.1 (117 clicks), 1:30 to 2:00 steep.
• Inverted method: 2.7.0 (108 clicks), 2:00 to 2:30 steep.
• Fine grind, short steep: 2.4.0 (96 clicks), 1:00 steep. More body, closer to espresso character.

Chemex

The Chemex filter is thicker than a V60 filter, so it absorbs more oils and slows down the brew. You need to grind a little coarser to compensate.

• Light roast: 4.3.3 (175 clicks).
• Medium roast: 4.5.1 (181 clicks).
• Dark roast: 4.7.0 (188 clicks).

Target brew time: 3:30 to 4:30 for a 30g dose with 500ml water. If the drawdown takes more than 5 minutes, go 4 clicks coarser.

French Press

Coarse grind. The metal mesh filter lets fine particles through, and those particles keep extracting while you drink. Too fine and you'll get a muddy, over-extracted cup.

• Light roast: 4.8.0 (192 clicks), 4:00 steep.
• Medium roast: 4.9.2 (198 clicks).
• Dark roast: 5.1.1 (205 clicks).
• Lighter body: go up to 5.3.0 (212 clicks).

Espresso

This is where the JX-Pro sets itself apart from most filter-focused hand grinders. With 40 clicks per turn it has enough precision to dial in espresso — something grinders like the Comandante C40, with 12 clicks per turn, can't do comfortably.

• Light roast: 1.0.1 (41 clicks).
• Medium roast: 1.1.3 (47 clicks).
• Dark roast: 1.5.0 (60 clicks).

Target shot: 25–30 seconds for 18g in and 36g out. If the shot runs too fast and tastes sour, go 2 clicks finer. If it drips slowly and tastes bitter, go coarser.

That said, the JX-Pro isn't a dedicated espresso grinder. It works well for home use, but if you're pulling 3–4 shots a day, an electric grinder with stepless adjustment will give you more control and consistency.

Moka Pot

• Light roast: 2.3.0 (92 clicks).
• Medium roast: 2.4.2 (98 clicks).
• Dark roast: 2.6.1 (105 clicks).

If the brew sputters and hisses, it's too fine. If it comes out pale and watery, it's too coarse.

How Roast Level Changes Your Setting

Same logic as any grinder: light roasts are denser and harder, so they need more surface area in contact with water, and that's why you grind finer. Dark roasts are softer and more soluble, they give up their flavors faster, and you grind coarser to avoid harsh, ashy notes.

The rule for the JX-Pro: light roast = base setting. Medium = +6 clicks (+0.1.2). Dark = +13 clicks (+0.3.1). That's all you need to remember.

At ~5 microns of effective change per click, those 6–13 clicks make a real, measurable difference in extraction. That's one of the upsides of having 40 clicks per turn instead of 12.

How to Dial In

The table gives you a starting point. Here's how to find your ideal grind from there:

1. Pick the starting point for your method and roast level.
2. Brew and taste. Brew time is a clue, but taste is what matters.
3. Adjust 2–4 clicks at a time. Sour and thin? Go finer (clockwise). Bitter and heavy? Go coarser (counterclockwise).
4. Change one thing at a time. Don't adjust grind and dose at the same time.
5. Write it down. The Rotation.Number.Tick system is built to be repeatable. Note your setting or use Coffee Master to log your brews automatically.

Most coffees land within 4–8 clicks of the starting point. If you're way off, check your water temperature or dose before going further.

Maintenance

The JX-Pro needs a monthly clean if you use it daily. The top adjustment mechanism has a specific process:

1. Remove the handle — lift it off, it's magnetic.
2. Remove the adjustment dial by turning counterclockwise.
3. Loosen the knurled nut counterclockwise while pressing the burr up from below.
4. Pull out the burr assembly by pushing the central shaft down.
5. Brush everything with a dry natural-bristle brush. No water on the burrs.
6. Reassemble in reverse order and recalibrate zero.

A few things to keep in mind:

• Always recalibrate after cleaning. Zero can shift 1–2 clicks when you reassemble. Check before you grind.
• Don't force the dial past the point of resistance when finding zero. Press too hard and the burr can jam.
• When filling the hopper, go slowly. Beans can drop into the adjustment dial gap. A small spoon or funnel helps.
• New burrs need a break-in period. The first 500g or so may grind a bit unevenly while the edges polish themselves. Use whatever beans you have on hand.

Common Issues