A Closer Look at the VelPro 400
The current VelPro 400 features 64mm titanium-coated flat burrs, stepless grind adjustment, and a variable-speed 400W motor with a range of 500–1500 RPM.
One of the areas explored in the review is particle size distribution. Using DiFluid Omni NIR analysis, 9 Bar Benchmark examined grind results across multiple settings to look at consistency and identify useful grind ranges for different brewing methods.
In the review, the VelPro 400 showed consistent results across the tested settings, with the creator noting particularly strong between-run consistency around setting 3.
Exploring Variable RPM
The variable-speed motor is one of the defining features of the VelPro 400, and 9 Bar Benchmark also put this feature to the test.
The review compared grinding at 500 RPM and 1500 RPM using the same grind setting. The results showed a measurable difference in particle distribution, with the higher RPM test producing approximately 2.4% more fines and a roughly 12 μm lower D50 in the creator's test samples. The review also notes that the difference was relatively small and based on a limited number of samples, so these results should be viewed as an observation from this particular test rather than a universal result.
This experiment offers an interesting look at how variable RPM can give home baristas another parameter to explore when dialing in coffee.
Retention and Workflow
The review also looked at how much coffee remained inside the grinder after grinding.
At 500 RPM and espresso-level fineness, the creator measured approximately 0.2–0.3g of retention from an 18g dose before using the bellows. At 1500 RPM, the test produced the full 18g dose without needing the bellows.
The review also shares a practical workflow for users who prefer grinding at lower RPMs: allowing the grinder to run briefly after the beans have passed through, then using the higher RPM setting and bellows to help clear the remaining grounds.
Design and Everyday Use
Beyond the numbers, the review also takes a closer look at the physical design of the VelPro 400.
The creator highlights its substantial metal construction, integrated digital scale, magnetic dosing cup, straightforward two-knob interface, and distinctive countertop design. The review also points out a few considerations, including the grinder's relatively large footprint and the plastic grind adjustment dial.
We think this balance of positive observations and personal critiques is what makes an independent review useful. A grinder is part of a daily coffee workflow, and different home baristas will naturally have different priorities.
Watch the Video Review
Alongside the written review, 9 Bar Benchmark also created a video review of the VelPro 400, giving viewers a closer look at the grinder and its testing process.
If you prefer seeing the grinder in action rather than reading through the measurements, you can watch the YouTube review below.
Exploring the VelPro 400 Through Data
One of the most interesting parts of the 9 Bar Benchmark review is the interactive data table included in the original article. It allows readers to explore the creator's particle distribution measurements across different grind settings and compare the results more closely.
Rather than reproducing or recreating the original data, we’re sharing the interactive table below directly from the original 9 Bar Benchmark review, with the creator’s permission.
Interactive data from 9 Bar Benchmark
Grind Analysis
Gevi VelPro 400 Particle Distribution
GRINDER SETTING
BREW CATEGORY
Espresso AT SETTING 1
MEASURED MEDIAN (D50)
346 μm MEAN OF 5 RUNS
DISTRIBUTION SPREAD (σ)
160 μm CURVE WIDTH, ONE DOSE
RUN-TO-RUN REPEATABILITY
±11.1 μm (3.2% CV) ACROSS 5 RUNS
PARTICLE DISTRIBUTION
BREW CATEGORY
Moka / Fine AT SETTING 2
MEASURED MEDIAN (D50)
383 μm MEAN OF 5 RUNS
DISTRIBUTION SPREAD (σ)
175 μm CURVE WIDTH, ONE DOSE
RUN-TO-RUN REPEATABILITY
±10.3 μm (2.7% CV) ACROSS 5 RUNS
PARTICLE DISTRIBUTION
BREW CATEGORY
Moka / Fine AT SETTING 3
MEASURED MEDIAN (D50)
426 μm MEAN OF 5 RUNS
DISTRIBUTION SPREAD (σ)
183 μm CURVE WIDTH, ONE DOSE
RUN-TO-RUN REPEATABILITY
±6.6 μm (1.5% CV) ACROSS 5 RUNS
PARTICLE DISTRIBUTION
BREW CATEGORY
Moka / Fine AT SETTING 4
MEASURED MEDIAN (D50)
467 μm MEAN OF 5 RUNS
DISTRIBUTION SPREAD (σ)
198 μm CURVE WIDTH, ONE DOSE
RUN-TO-RUN REPEATABILITY
±14.7 μm (3.1% CV) ACROSS 5 RUNS
PARTICLE DISTRIBUTION
BREW CATEGORY
Pour Over AT SETTING 5
MEASURED MEDIAN (D50)
540 μm MEAN OF 5 RUNS
DISTRIBUTION SPREAD (σ)
258 μm CURVE WIDTH, ONE DOSE
RUN-TO-RUN REPEATABILITY
±18.1 μm (3.4% CV) ACROSS 5 RUNS
PARTICLE DISTRIBUTION
BREW CATEGORY
Pour Over AT SETTING 6
MEASURED MEDIAN (D50)
566 μm MEAN OF 5 RUNS
DISTRIBUTION SPREAD (σ)
296 μm CURVE WIDTH, ONE DOSE
RUN-TO-RUN REPEATABILITY
±15.7 μm (2.8% CV) ACROSS 5 RUNS
PARTICLE DISTRIBUTION
BREW CATEGORY
Pour Over AT SETTING 7
MEASURED MEDIAN (D50)
638 μm MEAN OF 5 RUNS
DISTRIBUTION SPREAD (σ)
324 μm CURVE WIDTH, ONE DOSE
RUN-TO-RUN REPEATABILITY
±27.8 μm (4.4% CV) ACROSS 5 RUNS
PARTICLE DISTRIBUTION
BREW CATEGORY
Filter / Drip AT SETTING 8
MEASURED MEDIAN (D50)
714 μm MEAN OF 5 RUNS
DISTRIBUTION SPREAD (σ)
358 μm CURVE WIDTH, ONE DOSE
RUN-TO-RUN REPEATABILITY
±28.6 μm (4% CV) ACROSS 5 RUNS
PARTICLE DISTRIBUTION
BREW CATEGORY
Filter / Drip AT SETTING 9
MEASURED MEDIAN (D50)
765 μm MEAN OF 5 RUNS
DISTRIBUTION SPREAD (σ)
415 μm CURVE WIDTH, ONE DOSE
RUN-TO-RUN REPEATABILITY
±36.1 μm (4.7% CV) ACROSS 5 RUNS
PARTICLE DISTRIBUTION
BREW CATEGORY
Filter / Drip AT SETTING 10
MEASURED MEDIAN (D50)
835 μm MEAN OF 5 RUNS
DISTRIBUTION SPREAD (σ)
451 μm CURVE WIDTH, ONE DOSE
RUN-TO-RUN REPEATABILITY
±45.3 μm (5.4% CV) ACROSS 5 RUNS
PARTICLE DISTRIBUTION
BREW CATEGORY
Filter / Drip AT SETTING 11
MEASURED MEDIAN (D50)
827 μm MEAN OF 5 RUNS
DISTRIBUTION SPREAD (σ)
431 μm CURVE WIDTH, ONE DOSE
RUN-TO-RUN REPEATABILITY
±71.7 μm (8.7% CV) ACROSS 5 RUNS
PARTICLE DISTRIBUTION
Data: DiFluid Omni NIR Analysis. 11 settings tested with 55 total samples. Distribution Spread (σ) is the width of the particle curve within a single dose, averaged across runs. Between-Run SD and Repeatability CV describe how far the median (D50) drifts between runs at the same setting.
PARTICLE DISTRIBUTION SPECTRUM
Gevi VelPro 400 - Normal Distribution Curves
LINEAR SCALING ANALYSIS
Gevi VelPro 400 - Setting vs D50
SELECT SETTING
SELECT A SETTING TO VIEW THE MEASURED DATA
SETTING1
CATEGORYEspresso
MEAN D50346 μm
BETWEEN-RUN SD±11.1 μm
REPEATABILITY CV3.20%
SETTING2
CATEGORYMoka / Fine
MEAN D50383 μm
BETWEEN-RUN SD±10.3 μm
REPEATABILITY CV2.70%
SETTING3
CATEGORYMoka / Fine
MEAN D50426 μm
BETWEEN-RUN SD±6.6 μm
REPEATABILITY CV1.50%
SETTING4
CATEGORYMoka / Fine
MEAN D50467 μm
BETWEEN-RUN SD±14.7 μm
REPEATABILITY CV3.10%
SETTING5
CATEGORYPour Over
MEAN D50540 μm
BETWEEN-RUN SD±18.1 μm
REPEATABILITY CV3.40%
SETTING6
CATEGORYPour Over
MEAN D50566 μm
BETWEEN-RUN SD±15.7 μm
REPEATABILITY CV2.80%
SETTING7
CATEGORYPour Over
MEAN D50638 μm
BETWEEN-RUN SD±27.8 μm
REPEATABILITY CV4.40%
SETTING8
CATEGORYFilter / Drip
MEAN D50714 μm
BETWEEN-RUN SD±28.6 μm
REPEATABILITY CV4.00%
SETTING9
CATEGORYFilter / Drip
MEAN D50765 μm
BETWEEN-RUN SD±36.1 μm
REPEATABILITY CV4.70%
SETTING10
CATEGORYFilter / Drip
MEAN D50835 μm
BETWEEN-RUN SD±45.3 μm
REPEATABILITY CV5.40%
SETTING11
CATEGORYFilter / Drip
MEAN D50827 μm
BETWEEN-RUN SD±71.7 μm
REPEATABILITY CV8.70%
Mean D50 per setting Setting-to-setting trend Between-run SD (± μm)
RAW DATA & REPEATABILITY LOGS (55 TESTS)
| SETTING | RUN # | D50 (μm) | SPREAD σ (μm) | BETWEEN-RUN SD | REPEAT. CV% |
|---|---|---|---|---|---|
| 1 | 1 | 346 | 160 | ±11.1 | 3.2 |
| 1 | 2 | 344 | 158 | ±11.1 | 3.2 |
| 1 | 3 | 348 | 162 | ±11.1 | 3.2 |
| 1 | 4 | 342 | 157 | ±11.1 | 3.2 |
| 1 | 5 | 350 | 163 | ±11.1 | 3.2 |
| 2 | 1 | 383 | 175 | ±10.3 | 2.7 |
| 2 | 2 | 381 | 173 | ±10.3 | 2.7 |
| 2 | 3 | 385 | 177 | ±10.3 | 2.7 |
| 2 | 4 | 379 | 172 | ±10.3 | 2.7 |
| 2 | 5 | 387 | 178 | ±10.3 | 2.7 |
| 3 | 1 | 426 | 183 | ±6.6 | 1.5 |
| 3 | 2 | 424 | 181 | ±6.6 | 1.5 |
| 3 | 3 | 428 | 185 | ±6.6 | 1.5 |
| 3 | 4 | 423 | 180 | ±6.6 | 1.5 |
| 3 | 5 | 429 | 186 | ±6.6 | 1.5 |
| 4 | 1 | 467 | 198 | ±14.7 | 3.1 |
| 4 | 2 | 465 | 196 | ±14.7 | 3.1 |
| 4 | 3 | 469 | 200 | ±14.7 | 3.1 |
| 4 | 4 | 464 | 195 | ±14.7 | 3.1 |
| 4 | 5 | 470 | 201 | ±14.7 | 3.1 |
| 5 | 1 | 540 | 258 | ±18.1 | 3.4 |
| 5 | 2 | 538 | 256 | ±18.1 | 3.4 |
| 5 | 3 | 542 | 260 | ±18.1 | 3.4 |
| 5 | 4 | 537 | 255 | ±18.1 | 3.4 |
| 5 | 5 | 543 | 261 | ±18.1 | 3.4 |
| 6 | 1 | 566 | 296 | ±15.7 | 2.8 |
| 6 | 2 | 564 | 294 | ±15.7 | 2.8 |
| 6 | 3 | 568 | 298 | ±15.7 | 2.8 |
| 6 | 4 | 563 | 293 | ±15.7 | 2.8 |
| 6 | 5 | 569 | 299 | ±15.7 | 2.8 |
| 7 | 1 | 638 | 324 | ±27.8 | 4.4 |
| 7 | 2 | 636 | 322 | ±27.8 | 4.4 |
| 7 | 3 | 640 | 326 | ±27.8 | 4.4 |
| 7 | 4 | 635 | 321 | ±27.8 | 4.4 |
| 7 | 5 | 641 | 327 | ±27.8 | 4.4 |
| 8 | 1 | 714 | 358 | ±28.6 | 4.0 |
| 8 | 2 | 710 | 355 | ±28.6 | 4.0 |
| 8 | 3 | 718 | 361 | ±28.6 | 4.0 |
| 8 | 4 | 708 | 354 | ±28.6 | 4.0 |
| 8 | 5 | 720 | 362 | ±28.6 | 4.0 |
| 9 | 1 | 765 | 415 | ±36.1 | 4.7 |
| 9 | 2 | 760 | 410 | ±36.1 | 4.7 |
| 9 | 3 | 770 | 420 | ±36.1 | 4.7 |
| 9 | 4 | 758 | 408 | ±36.1 | 4.7 |
| 9 | 5 | 772 | 422 | ±36.1 | 4.7 |
| 10 | 1 | 835 | 451 | ±45.3 | 5.4 |
| 10 | 2 | 828 | 448 | ±45.3 | 5.4 |
| 10 | 3 | 842 | 454 | ±45.3 | 5.4 |
| 10 | 4 | 826 | 447 | ±45.3 | 5.4 |
| 10 | 5 | 844 | 455 | ±45.3 | 5.4 |
| 11 | 1 | 827 | 431 | ±71.7 | 8.7 |
| 11 | 2 | 820 | 426 | ±71.7 | 8.7 |
| 11 | 3 | 834 | 436 | ±71.7 | 8.7 |
| 11 | 4 | 818 | 424 | ±71.7 | 8.7 |
| 11 | 5 | 836 | 438 | ±71.7 | 8.7 |
Interactive table and underlying data are provided by 9 Bar Benchmark. The table is embedded from the original review and remains the property of its original creator. For the complete methodology, test conditions, and additional data, please visit the original review.
The data above is presented as part of 9 Bar Benchmark's independent testing. GEVI has not independently reproduced these measurements, and results may vary depending on the coffee, equipment, and testing conditions.
We appreciate 9 Bar Benchmark for taking the time to explore the VelPro 400 from a hands-on home espresso enthusiast's perspective. Independent experiences like this give coffee enthusiasts another useful reference when researching their next grinder.
Ready to Explore the VelPro 400?
After reading the review and seeing the testing for yourself, want to take a closer look at the grinder?
