Yes, many activity trackers do this. It is interesting to wear 2 of the same trackers, one in each wrist, and see if they are close to agreeing. I do that wit

Yes, many activity trackers do this. It is interesting to wear 2 of the same trackers, one in each wrist, and see if they are close to agreeing. I do that with 2 Mi Bands. The variance of a single point estimate is infinite.