Garmin HRM 600 vs Polar H10: which heart rate strap is more accurate?

Both straps deliver higher accuracy than any optical wrist sensor and support multiple simultaneous Bluetooth connections. The Polar H10 has a longer track record and broader third-party compatibility across non-Garmin apps and gym equipment. The HRM 600 integrates more tightly with Garmin watches, transmitting running dynamics (cadence, ground contact time, vertical oscillation) that the H10 cannot. If you use a Garmin watch, the HRM 600 adds more data. If you use a mixed ecosystem, the Polar H10 is more widely supported.

Is the Garmin HRM 600 worth the upgrade from the HRM Pro Plus?

The HRM 600 uses the same sensor technology as the HRM Pro Plus. The main differences are a redesigned strap with better comfort and a new clasp mechanism. If your HRM Pro Plus still works and fits well, the upgrade offers marginal gains. If you are buying your first Garmin chest strap, the HRM 600 is the current model to choose.

How accurate is the HRM 600 for swimming?

The HRM 600 stores heart rate data during pool and open water swims, then syncs it to your Garmin watch after the session. It does not broadcast live heart rate data underwater because Bluetooth and ANT+ signals cannot penetrate water reliably. The stored data is accurate to within 1 to 2 bpm of a medical-grade ECG strap in pool tests.