J-Ultra

Published specifications.

Power

Hand-powered

Burr

48 mm coated conical

Adjustment

External · 100 clicks / rotation

Burr movement / click

8 µm

Capacity

35–40 g

Weight

670 g

Catch cup

Magnetic

Brew applications

Espresso · Turkish · AeroPress · Moka pot · Drip / batch · Pour-over · Siphon · French press

Check the exact model and included parts with the linked manufacturer. Regional versions and replacement burrs can change the specification.

What changes in daily use.

Why shortlist it

• Hand-powered operation for a compact, unplugged setup.
• External · 100 clicks / rotation adjustment.
• Published adjustment movement: 8 µm.

The trade-off

Espresso-focused geometry and hand grinding require a different workflow from an electric hopper grinder.

Before you buy or brew

1. Espresso-focused geometry and hand grinding require a different workflow from an electric hopper grinder.
2. Use the exact model and burr revision when reading a grind chart.
3. Check the dose fits the chamber and that hand grinding suits your routine.

Grind settings by brew method.

Use these as starting references for this exact model. Settings from a maker’s recipe retain that recipe’s dose and batch context.

“No verified setting” does not by itself mean a method is impossible. It means we have not established a published value for the exact model. Do not interpret burr movement in microns as coffee particle size.