Early in July, I compared the daily step counts of the Oura ring and the Withings watch (see post of 7/9/2019). In an informal test over a short course, I concluded that, “...the watch consistently counted half the steps, as though it were counting strides, not steps.” In a subsequent multi-day test, I compared the step counts from the two devices after wearing them on the same hand all day. Again, the Withings watch counted differently. Since that time, I have been wearing a more comfortable watch band and have been taking longer hikes. Below is a plot of the step counts I got over the last 10 days. Two things are immediately obvious. (1) The two devices show the same lows and highs. Both are good for looking at changes in performance over time. (2) The two devices disagree a lot on the actual number of steps. If I were using the ring to track the number of days I walked 10,000 steps a day (the default goal of most fitness trackers), I...