# I pitted the Apple Watch Ultra 4 against the Garmin Fenix 9 Pro and an electrical heart-rate monitor to check the accuracy of Apple’s new Health Sensing System — here are the results

> The Garmin Fenix 9 Pro and Apple Watch Ultra 4 are two of the best (and most expensive) smartwatches to come out this year. But just how accurate are they?

- **Source:** [TechRadar](https://www.techradar.com/health-fitness/smartwatches/apple-watch-ultra-4-vs-garmin-fenix-9-pro-i-wore-them-both-for-a-run-with-an-electrical-heart-rate-monitor-and-im-excited-to-report-that-both-watches-nailed-it?utm_source=gearopen.com&utm_medium=referral&utm_campaign=feed&utm_content=6ac9d943d80a1ac9ff734452)
- **Published:** 2026-10-10
- **Category:** Wearables
- **Tags:** #apple #apple-watch #garmin
- **Canonical:** http://localhost:4321/a/6ac9d943d80a1ac9ff734452

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_GearOpen's distilled summary. The full original article is published at TechRadar (source link above); GearOpen does not republish the source's full text._