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From watts to calorie burn, the 4iiii Shimano XT 8100 PRECISION 3 Left-Side Power Meter accurately measures our data, using three strain gauges to ensure a /-1% accuracy. Its automatic terrain selector offers an easy transition between smooth pavement and rough trails, while the IPX7 waterproof rating keeps us riding through rainy conditions. What we like most is its 800 hours of battery life, allowing us to ride for long stretches without worrying about a last-minute charge.