COSMED K5 vs VO2 Master Pro
Specs, prices, editor verdict, and who should buy which — compared side-by-side.
These are close picks. Both score in the same range. The right call depends on buyer profile — read the per-buyer recommendations below.
Side-by-side specs
| Spec | COSMED K5 | VO2 Master Pro |
|---|---|---|
| price | $14,000–$18,000 | $4,500–$5,500 |
| type | Portable breath-by-breath metabolic analyzer | Wearable VO2 analyzer |
| measurements | VO2, VCO2, RER, EE, RMR | VO2, VO2max estimation, RER |
| portability | Wearable chest unit, ~2 lbs | Mask-mounted unit |
| battery | 3+ hours | 3-4 hours |
COSMED K5 also publishes: accuracy, warranty
VO2 Master Pro also publishes: app
Who should buy which
Family offices with multiple longevity-focused members. Private trainers / coaches serving HNW clients. Buyers who specifically want the gold-standard measurement quality, not the wearable-estimated version.
You only need 1-2 VO2 measurements per year (use a clinic). You don't want B2B-tier purchasing complexity (annual calibration contract, occasional service visits).
Individual athletes, longevity-focused individuals wanting personal VO2 tracking, private coaches with HNW clientele. The entry tier where individual ownership becomes economically rational.
You need clinical-grade validation (step up to PNOE or COSMED), or you only need 1 test per year (use a local clinic).