1Zpresso JX-Pro Review: 12.5 Microns a Click, 45 Seconds a Shot

Forty clicks a rotation

The number that matters on this grinder is 12.5 microns per click.

Forty clicks in a full rotation, more than two hundred settings in total, and a dial that sits inside the hopper so you can change grind size without pulling the catch cup off.

For pour-over that precision is a luxury. For espresso it is the entire product. The gap between a shot that runs in 28 seconds and one that chokes the machine is a few tens of microns, which is one or two clicks here and an unrepeatable guess on most grinders.

Coffee Chronicler puts the difference plainly: the standard JX has 30 clicks per rotation, and that coarser step is the reason to pay for the Pro if espresso is why you are buying.

Forty-eight millimetres of burr

Craft Coffee Spot makes the observation that puts the specification in context: 48 mm burrs are uncommon in manual grinders and larger than some electric grinders carry.

Stainless steel, conical, running in dual bearings inside an aluminium alloy body.

That is the mechanical reason the consistency holds up. Craft Coffee Spot reports very few fines left inside the grinder after use, and Coffee Chronicler describes remarkably uniform particles with minimal fines across both JX models.

The time it takes

Espresso, 20 grams: 48 seconds at setting 14 per Brew Coffee Home, about 45 seconds per Coffee Chronicler.

Pour-over: under 20 seconds per Brew Coffee Home, about 24 seconds for 15 grams per Coffee Chronicler.

Craft Coffee Spot's rule of thumb covers both: roughly one gram per second.

Espresso is slower because the burrs are working against a much finer setting. That is physics rather than a fault, and it is the honest cost of the machine.

Which brings us to your arm

Craft Coffee Spot says it directly: the grinder requires physical effort and is not ideal for anyone with limited grip strength.

Brew Coffee Home calls the same action almost effortless, which is a comparison against other manual grinders rather than against an electric one.

Both can be true. A five-inch handle reach gives real leverage, and it is still forty-five seconds of cranking before every shot, every day.

The small stuff

The hopper holds about 35 grams and the catch cup about 40, so a batch for a cafetière of any size means grinding twice.

Brew Coffee Home found beans occasionally lodging in the adjustment ring while pouring.

They also note a limitation at the very coarsest end of the range, which is worth knowing if cold brew is the plan.

And it weighs around 800 grams. Coffee Chronicler's 760 gram figure is the lightest of the three, and it still puts the grinder in the same bracket as a Comandante C40, which nobody packs for a weekend.