We do not know that for sure. But the North Pole Engineering Runn Treadmill Sensor is one of the most accurate treadmill sensors. Also fellnr tested the NPE Runn: https://fellrnr.com/wiki/North_Pole_Engineering_Runn_Treadmill_Sensor his conclusion: «So, is it worth it? Well, the sensor is fairly cheap, listing at $99 at the time of writing, and it’s almost certainly …