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Updated on Apr 30, 2026
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GRINDER REVIEW
Geimori GU38 Review: Budget Single-Dose Grinder Tested
The Geimori GU38 is a budget friendly electric grinder great for filter coffee and the occasional espresso.
I've been picking apart the Geimori GU38 for a few weeks now. Wirsh sent it to me for testing and, let's just say, I put the grinder through its paces. It comes with 38mm 6-core burrs, a promise of "Zero retention", stepless adjustment, magnetic dosing cup, and wood accents.
If it reminds you of the Varia VS3, then you're alone. We'll also look at how the GU38 compares to its competition.
This article contains affiliate links to Amazon. As an Amazon Associate I earn from qualifying purchases.
Who it’s for
Who should buy the Geimori GU38
The Geimori GU38 is a great entry-level grinder, the kind you buy to figure out whether this hobby is really for you before committing serious money.
If you’re just getting into specialty coffee, you’ve watched a few James Hoffmann videos, started caring about where your beans come from, picked up an entry-level espresso machine and an AeroPress, and now want to grind fresh, the GU38 is a great choice. It’s adjustment wheel from 0 to 65 let’s you pull a shot of espresso as well as experiment with the likes of V60, French Press and Cold Brew. On top of that it also looks decent enough to leave on the counter.
Sturdy body, walnut accents, magnetic dosing cup. The GU38 is surprisingly well made.
First impressions
Build quality of the GU38
To be frank, the GU38 looks and feels better than it probably should at it’s price when on sale.
The GU38’s body is made from aluminum, the internals are stainless, it comes with a wooden lid and feels overall sturdy and well made. It’s footprint is small, around 160 × 92 × 314 mm, give or take a centimeter.
The 30g hopper suits a single dose workflow. A clever little design detail is the magnetic dosing cup that snaps in place. The exit chute itself comes off for cleaning, and bellows come in the box for purging the burr chamber after each grind. It also came with a RDT spray bottle and a simple brush.
It’s not on the heavy side but it also isn’t designed for travel. I appreciate its sturdy feel and would go so far to say it oozes build confidence.
Something that personally bugs me a little is how closely the design resembles the Varia VS3. Both use almost the same visual recipe: a compact sloped single-dose body, top grind-adjustment/hopper cylinder, front chute, and magnetic dosing cup area.
Fine and medium fine grind comparison.
Grind quality
Workflow, grind quality, and how the GU38 performs across brew methods
Mechanically the Geimori GU38 is straightforward. Give your beans a little spritz before grinding to prevent retention.
The workflow. Drop your beans into the small hopper, snap the magnetic cup under the chute, adjust the grind size from 0 to 65, and hit that power button to the right. The DC motor spins the 38mm burrs at 190 RPM, which means it isn’t the fastest horse in the stable (forgive the horse analogy, I just binge watched 5 seasons of Yellowstone).When the beans are through, you hit the bellows a couple of times to push out retained grounds, lift the cup off, and you’re ready to brew.
What I really miss when using it is an auto shut off. The external power adapter is on the bulky side, which is a small ergonomic nag but as I have limited power outlets in my kitchen it means I ned to remove the power adapter each time and store it away until the next grind.
For espresso, it holds its own. While a 38mm conical at 190 RPM is a fair burr setup for medium to coarse grinds, I will say it also performs well for espresso. Disclaimer, I have a Flair 2GO, so not a fancy espresso machine, and for my setup I am satisfied with the finer grind outputs.
For filter, it depends. While I found it to produce relatively uniform grinds in the medium setting, the coarser settings for french press and cold brew produced more uneven particles.
About the “zero retention” claim. Wirsh claims ultra-low retention, often less than 0.1g when using the included bellows. My results have been pretty close to that, with an average of 0.1g and 0.2g of retention when grinding for espresso.
Espresso / Fine
Pour-over / Medium
French Press / Coarse
Pros and cons
| Pros | Cons |
|---|---|
| Compact design | No auto shut-off |
| Sturdy build quality | Bulky external power adapter |
| 38mm 6-core conical burrs | Popcorning can interrupt workflow |
| Stepless adjustment | Coarse grind consistency not great |
| Good accessory bundle |
Competitor comparison
How the Geimori GU38 compares with the Varia VS3, Baratza Encore ESP, Fellow Opus 2, and Breville Dose Control Pro
The GU38 sits near the lower end of this group on price, but it is not competing on price alone.
Varia VS3
The VS3 is the most direct competitor for the GU38. Both are compact single-dose conical grinders with metal bodies, low-speed motors, bellows, and stepless adjustment. The difference is that the VS3 has a more developed platform, and uses a larger 48mm conical 6-core burr set with 38mm inner diameter. It is the better choice if the priority is a stronger technical case for consistency, but it is also more expensive. The GU38 gets pretty close in form factor and basic workflow.
Baratza Encore ESP
While the Baratza Encore ESP is not the most refined grinder nor is it the best-looking one, 20 spresso-focused steps, and 20 more filter and coarser brewing steps give repeatable reference points. That makes it easier to dial in for beginners than a fully stepless grinder. The trade-off is precision, a stepless grinder like the GU38 gives more freedom when espresso needs adjustments in tiny increments.
Fellow Opus 2
The Opus 2 is the strongest candidate with larger 48mm conical burrs, stepless side adjustment, automatic stop, two catch cups, a 100g load bin, anti-static grinding, tool-free burr access, and an internal impeller designed to move grounds through the grinder with lower carryover. It is built for people who switch between espresso, pour-over, AeroPress, French press, and cold brew often. Compared with the GU38, the Opus 2 is more feature-rich as an allround home grinder with extra perks that improve the grinding experience. The GU38 is more compact and a whole lot slimmer, but has fewer workflow aids.
Breville Dose Control Pro
The Dose Control Pro is a different kind of grinder as it is a hopper-based timed grinder. It has 60 grind settings, stainless steel conical burrs, direct grinding into a portafilter or filter basket, and a timer adjustable in one-second increments. It is simple, it is familiar, and it works for basic espresso and general brewing. It is not the strongest comparison for the GU38 if you seek low retention, single dosing, compact workflow, or clean bean-to-bean switching. The Dose Control Pro is ideal if you want timed dosing. It is not the best pick to dial in espresso with small incremental changes.
Final Verdict
The final read on the Geimori GU38
Wirsh gives the Geimori GU38 good setup for your money. The grinder has a 38mm conical burr set, stepless adjustment, a 30g hopper, a 54mm aluminum dosing cup, a compact metal body, and a low-speed 190 RPM motor. The Amazon listing also states a 1-year hassle-free replacement warranty, which is not especially long for this category.
The Geimori GU38 is a credible budget single-dose grinder. Its strengths are its build quality, compact design, it’s easy to use, and better built than many low-cost grinders. It also fits small kitchen spaces. It performs best for medium grind sizes, and the occasional espresso. While the retention is not always zero, it comes pretty close most of the time. Overall, I can say it surprised me positively and I enjoy using it for my everyday coffee needs.
FAQ
Geimori GU38 frequently asked questions
Visually, yes. The form factor, walnut accents, and stepless collar are clearly inspired by the VS3. Performance of the GU38 comes with some trade offs but it’s also cheaper.
You can defeinitely pull a drinkable shot, but you’ll get more day to day variance than from a grinder built for espresso first.
Medium grinds for filter is the GU38’s strong suit. A 38mm conical at 190 RPM does a respectable job for V60, Chemex, AeroPress, and French press. Dial somewhere in the upper third of the range and you’re golden.
I would say it is pretty accurate as in the retention is very low at 0.1g or 0.2g for the most part.
About 75 dB means it is not whispering but also not shouting if that makes sense.
I would say, if you get the grinder for under 200$ it is a great option for starting out your coffee journey. If you otherwise work with high end equipment it might be worth at looking for a more premium grinder.
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