Independent testing
How much independent testing exists for each hair dryer
Of the 9 hair dryers we track, 9 have been physically measured by at least one independent lab and 1 by three or more. Below is every one, ordered by how much independent hands-on evidence stands behind it — densest first.
A coverage record, not a ranking of which is best.
| Product | Independent labs | Metrics measured | Outlets on record |
|---|---|---|---|
| Dyson Supersonic | 3 | 2 | 3 |
| Shark HyperAIR IQ Hair Dryer | 2 | 3 | 2 |
| Revlon One-Step Volumizer Original 1.0 | 2 | 2 | 2 |
| Shark FlexStyle Air Styling & Drying System | 2 | 2 | 3 |
| ghd Helios Professional Hair Dryer | 1 | 4 | 2 |
| Laifen Swift Special High-Speed Hair Dryer | 1 | 2 | 2 |
| Dyson Supersonic Nural | 1 | 1 | 2 |
| Dyson Supersonic r Professional | 1 | 1 | 2 |
| T3 AireLuxe Professional Hair Dryer | 1 | 1 | 1 |
Each figure is a count of what independent testers actually did — how we count. A low count means little independent evidence has been gathered yet, never that a product is worse. See also the Hair Dryers buying guide and the reviewers we cite.