It’s not surprising that Epson-sponsored Meb Keflezighi chooses the SF-810. It’s a pure, no-nonsense run watch with deep training and racing features—and no activity tracking or phone notifications. The most popular running watch brand in Japan, Epson is also a major player in mobile sensing. In the SF-810, Epson uses its own highly efficient GPS and other sensors for 20 hours of battery life with GPS and HR enabled. The HR sensor is among the most reliable we have tested. Stride length is automatically calibrated to GPS and takes over in blind spots (think trails). One of Meb’s favorite 810 metrics is to compare his stride length to cadence. Altitude, ascent and descent data is via GPS.
Setting up via the watch is a bear, but is easy via the Run Connect app.
How fast was that last 5K, 10K, etc.?
Set up auto laps for every mile, along with four other distances of your choosing.
Quick heart rate read
No need to be in a workout mode to see your heart rate. Great for a morning check.