· 7 min read
Why Your Espresso Tastes Sour (and How to Fix It)
Sourness is the most common espresso failure and the least understood. A bench-side guide to diagnosing under-extraction in three shots or fewer.
Mara Lindqvist · Lead Tester
Bench notes & experiments
The Journal.
What we learn on the bench, published between guides — diagnostics, teardown experiments, and the reasoning behind our methods.
· 9 min read
We Upgraded a Budget Grinder's Burrs. Here's What Actually Changed.
We put $90 aftermarket flat burrs into a $99 grinder and measured the result with a lab-grade particle analyzer. The truth is more interesting than the marketing.
Daniel Okafor · Lab Manager
· 8 min read
The Cheapest Upgrade in Coffee Is Your Water
Two minerals decide most of what you taste in the cup. We built three waters from scratch and brewed 150 batches to map the effect.
Mara Lindqvist · Lead Tester
· 6 min read
How We Score Gear: Inside the BrewBench Bench Test
Every score on this site comes from a measured, repeatable protocol. Here is the whole system — the meters, the blind panels, and why we publish the numbers.
The BrewBench Team · Editorial
Editorial record
How this page was made
Who wrote and reviewed it
Written by the BrewBench editorial team — named testers who buy every product at retail. Reviewed by Daniel Okafor, Lab Manager, and fact-checked against our published protocol before publication.
| Published protocol | How we test |
|---|---|
| Bench work | Every published score follows the written protocol |
| Products graded | 12 products with published reviews |
| Last updated | See each guide or review for its own test date |
Scope & limitations
This page is for home baristas and anyone comparing coffee gear. We cover the products and methods we have tested on our own bench; we do not cover gear we have not measured.
- We only tested the products listed in our published reviews; out of scope means no BrewBench score.
- We did not test long-term reliability beyond each review window.
Sources & corrections
- BrewBench Testing Methodology — primary source for sampling, instrumentation and the scoring rubric.
- Editorial Standards & Corrections Policy — our review process and how corrections are recorded.
- The BrewBench Team — named testers, credentials and the nine-person blind panel.
Corrections: if a measurement or verdict is wrong, we correct the page and note the change in our editorial standards. Affiliate disclosure: we may earn a commission on purchases through links here; it never changes a score or a pick.