Does the device measure pace separately from the treadmill displayed pace? I think mine is way off. It’s 20% off from my watch. I am guessing the real pace is somewhere in between. I am hoping Runn Sensor will resolve the issue.
Yes. The Runn will measure the belt speed. Depending on the make/model of your treadmill this will be different to what the treadmill is reporting. You can calibrate the Runn so it matches the treadmill reported speed.
Your watch uses its accelerometer to gauge speed. Depending on your running style depends on the accuracy of this. Most Garmin watches you can calibrate over time to better match the treadmill reported speed.