2015 Triathlete Buyer’s Guide: Run Watches

TomTom Runner Cardio

$270, Tomtom.com
The draw: Strapless heart rate monitoring

No need for a chest strap with the Runner Cardio. A sensor embedded in the watch detects changes in blood flow by shining a light through your skin. When cinched tightly, it reads heart rate accurately. The GPS-enabled run computer has a four-sided button underneath the easy-to-read display and is Bluetooth ready to connect wirelessly to your phone. You can customize your workout with heart rate zones, intervals, speed or distance goals, and a race mode allows you to compete against your previous efforts.

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