Geimori GU38 Coffee Grinder | Compact All-Purpose Grinder

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$179.99
$249.99
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A slim single-dose grinder for home brewers who want precise grinding in a smaller footprint — from daily filter coffee to espresso-style dialing.

3.5-inch ultra-slim full metal body

38mm 6-core conical burr

Stepless 0–65 adjustment

Low-retention workflow

Global voltage compatibility

Supports 100–240V, 50/60Hz. A region-matched plug is included based on shipping destination.

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United States, United Kingdom, Australia & Japan: Estimated delivery by Sep 08 - Sep 10
Other countries and regions: Estimated delivery by Sep 13 - Sep 17
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2-year warranty

30-day returns

Secure checkout

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Technical Specifications

01

Model

Geimori GU38

02

Electrical specifications

DC Adapter input: 100-240V~, 1.7A, 50/60Hz. 

Output: 24 V⎓, 3.0 A, 72.0 W

03

Grind adjustment & scale

Stepless · marked scale from 0 through 5

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Burr size / type

38 mm 6-core conical burrs

05

Material

Housing: Die-cast aluminum with surface coating 

Grinding Chamber: CNC aluminum
Burr: SUS420 stainless steel · HRC 58

06

Burr life

500 kg

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Recommended duty cycle

60 seconds grinding · 90 seconds rest

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Adjustment reference

0.02 mm (20 μm) relative vertical burr shift per  increment

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Retention · 10 g dose

<0.1 g with bellows

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Grinding rate

Espresso: 0.6 g/s

Filter: 0.8 g/s

11

Hopper capacity

30 g

12

Dosing cup capacity

40 g

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Dosing cup

54 mm

14

Motor

80W DC motor · 170 RPM

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Operating voltage

24 V DC

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Dimensions

162 × 90 × 317mm

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Weight

2,375 g

Frequently Asked Questions

How should I reduce retained grounds?

The straight-through design minimizes retention naturally. For the best results, we recommend two simple pro tips: 1) Use the "RDT" to eliminate static, and 2) Press the hopper bellows at the end of the grind to purge any remaining particles.

Is the stepless adjustment difficult for beginners to dial in?

The GU38 offers 0.02 mm precision, which allows you to find the exact "sweet spot" for espresso that stepped grinders often miss. While there is a slight learning curve to find your perfect setting, the reward is superior flavor clarity.

How consistent is the grind?

Thanks to the 38mm 6-Core CNC Stainless Steel Burrs (HRC58), it delivers pro-level particle distribution comparable to much pricier units. The high-nitrogen steel burrs stay sharp for years, delivering uniform grounds from espresso to French press.

Can the GU38 grind fine enough for professional espresso machines?

Thanks to the 38mm 6-Core CNC Stainless Steel Burrs (HRC58), it delivers pro-level particle distribution comparable to much pricier units. The high-nitrogen steel burrs stay sharp for years, delivering uniform grounds from espresso to French press.

Do I need tools to clean the grinder?

No tools needed. The tool-free design allows you to access the burrs in seconds for deep cleaning. We include a professional brush to remove residue and prevent flavor cross-contamination, keeping your grinder pristine.

Instructional Videos

What Our Customers Are Saying

Geimori GU38 Coffee Grinder | Compact All-Purpose Grinder