JX-Pro Manual: The Complete Guide to Using Your 1Zpresso JX-Pro Hand Grinder

I bought my 1Zpresso JX-Pro without reading the manual. I figured, how hard can a hand grinder be? Turns out, there are a few things I wish I had known from the start, especially around the adjustment dial, calibration, and maintenance. After over a year of daily use, I have a solid understanding of how this grinder works and how to get the most out of it.

Whether you just unboxed your JX-Pro or you are considering buying one and want to know what the setup process looks like, this guide walks through everything the manual covers, plus the practical tips that only come from actual use.

Initial Setup and Calibration

When you first open the JX-Pro, you will find the grinder body, the crank handle, the adjustment dial, and a small brush. Assembly takes about 30 seconds. Slide the crank arm onto the top shaft and tighten the knob.

Before you grind anything, you need to find your zero point. This is where the burrs touch and no beans can pass through.

How to Find Your Zero Point

  1. Remove any beans from the hopper.
  2. Turn the adjustment dial clockwise (looking down from the top) until you feel the burrs touch and hear a slight scraping sound.
  3. At this point, check the number on the dial. This is your zero reference.
  4. Every click outward from this point equals approximately 12.5 microns of adjustment.

I recommend writing down your zero point and checking it every month or so. Over time, the burrs wear in slightly and the zero can shift by a click or two. This is normal and actually a good thing, as the burrs get smoother and more consistent after they are broken in.

Understanding the Adjustment Dial

The external adjustment dial is the JX-Pro's standout feature compared to other hand grinders. Instead of removing the burr and turning an inner ring (like the Timemore C2 or Hario Skerton), you just twist the numbered dial on top.

Each full rotation of the dial is 40 clicks. The dial has numbers from 0 to 40 printed on it, making it easy to track your setting.

These are the ranges I have settled on after testing extensively. Your preferences may vary depending on bean type, roast level, and personal taste.

Espresso: 10 to 20 clicks from zero. Most medium roasts land around 14 to 16 clicks for a standard 18g in, 36g out shot in about 28 seconds.

AeroPress: 20 to 30 clicks. I like 24 clicks for a concentrated AeroPress brew with an inverted method and 2-minute steep.

Pour-over (V60, Kalita Wave): 28 to 36 clicks. My V60 sweet spot is around 30 clicks for a 3:00 to 3:30 total brew time with 15g of coffee and 250g of water.

French press: 36 to 48 clicks. Go coarser than you think. I use about 40 clicks for a 4-minute steep.

Cold brew: 48+ clicks. As coarse as it goes. The big particles prevent over-extraction during the long steep time.

For a wider look at grinders suited to different brew methods, our Best Coffee Grinder guide covers the top options across every price range.

How to Grind Properly

This sounds obvious, but technique matters more than you might expect with a hand grinder.

Loading the Beans

Pop off the top cap and pour your beans directly into the hopper. The capacity is about 30 to 35 grams. I always weigh my beans before loading. Overfilling jams the burrs on the first few turns and makes grinding harder than it needs to be.

Grinding Technique

Hold the grinder body with your non-dominant hand and turn the crank with your dominant hand. Keep a steady, moderate pace. Going too fast does not save time and can actually produce less uniform grounds because the beans bounce around inside.

For espresso settings, expect to grind 18 grams in about 40 to 60 seconds. Pour-over is faster, around 25 to 35 seconds for 15 grams.

One trick I learned early: grip the grinder lower, near the collection cup, not at the top. This gives you better stability and puts less strain on your wrist.

Collecting the Grounds

The magnetic collection cup at the bottom holds your finished grounds. Pull it straight down to detach. I grind directly into my portafilter for espresso to avoid transfer loss, but the cup works well for pour-over and French press.

Maintenance and Cleaning

The JX-Pro is low maintenance, but a few regular habits will keep it performing well for years.

After Every Use

Blow through the grinder or use a small bellows to clear retained grounds. The JX-Pro retains about 0.1 to 0.2 grams between sessions, which is very low for any grinder. A quick blow-through reduces this to nearly zero.

Weekly

Use the included brush to clean the burrs. Remove the outer burr by unscrewing the adjustment dial (turn it counterclockwise until it lifts off), then pull the inner burr assembly out. Brush away any stuck particles and oil residue.

Do not use water. The stainless steel burrs will not rust, but moisture can cause issues with the bearings and internal components.

Monthly

Do a deeper inspection. Check the burrs for any chips or damage (unlikely but worth verifying). Reassemble and recalibrate your zero point. After the first few months, you may notice the burrs have broken in, making grinding smoother and your shots tasting better.

When to Replace Burrs

With home use (one to three grinds per day), the stainless steel burrs on the JX-Pro should last several years. Some users report 5+ years without replacement. If you notice your grind consistency dropping or the burrs feel dull, 1Zpresso sells replacement burr sets on their website.

Troubleshooting Common Issues

Grinding Is Very Hard at Fine Settings

This is normal for espresso-range grinds, especially with light roasts. Make sure you are not overfilling the hopper. Try grinding only 15 grams at a time if 18 grams feels like too much effort.

The Dial Feels Loose

Check that the dial is seated properly on the shaft. If it spins freely without clicking, you may have overtightened it past zero. Remove the dial, reseat it on the shaft, and recalibrate.

Grounds Are Inconsistent

If you notice large chunks mixed with fines, check your burr alignment. Remove the outer burr and make sure it is seated evenly. Also confirm the inner burr has not shifted. This is rare but can happen if the grinder is dropped.

Static Cling in the Collection Cup

Try the Ross Droplet Technique. Add one tiny drop of water to your beans before grinding. This eliminates almost all static without affecting grind quality.

Frequently Asked Questions

Can I travel with the JX-Pro?

Yes, and it is actually one of the better travel grinders thanks to its compact size (about 6 inches tall) and sturdy build. I have taken mine on several trips. It fits easily in a carry-on bag or even a large jacket pocket.

Does the JX-Pro come with a carrying case?

Yes. It ships with a padded carrying case that fits the grinder, handle, and brush. The case is decent quality and provides good protection.

Can I use the JX-Pro for both espresso and pour-over?

Absolutely. I switch between espresso and V60 several times a week. Just note your click settings for each method. Switching takes about two seconds since the dial is external.

How does the JX-Pro compare to the K-Plus?

The K-Plus has a slightly larger burr and finer adjustment increments (about 10 microns per click vs. 12.5). It also has a more refined build with a wooden knob. For most home users, the difference in the cup is subtle. The JX-Pro is the better value unless you want the absolute best hand grinder available.

Quick Reference Card

Keep this handy until you memorize your settings:

  • Zero calibration: Burrs touching, slight scraping sound
  • Espresso: 10 to 20 clicks
  • AeroPress: 20 to 30 clicks
  • Pour-over: 28 to 36 clicks
  • French press: 36 to 48 clicks
  • Cold brew: 48+ clicks
  • Cleaning: Brush weekly, recalibrate monthly

The JX-Pro rewards consistent use and attention to your grind settings. Once you find your numbers for each brew method, you will have a grinder that punches well above its price class. Bookmark your click settings, keep it clean, and enjoy the process.