Which treadmill should really serious scientists buy?

We do not know the answer. Under Google Scholar about «treadmill»: https://scholar.google.com/scholar?start=0&q=treadmill&hl=de&as_sdt=0,5 We haven’t found a really serious scientist who tests treadmill accuracy. Also none who has tested the accuracy of Xiaomi threadmills: https://scholar.google.com/scholar?start=10&q=xiaomi+treadmill&hl=de&as_sdt=0,5 If treadmills for sporting acitivities would be of interest for really serious scientists, would they not write papers about those and …