I use a Garmin Vivofit 2.

Together with “My Fitness Pal”. Again, I’m trying to make up for the fact that maybe I’m a bit complacent in the real world, by still trying to keep my weight under control. My Fitness Pal tracks my calorie intake, while the Vivofit 2 keeps track, supposedly, of how many I burn. And during times when I’m accurate at actually logging all my food intake, I find that the results are good predictors, of whether that dreaded dial of the scale will increase during the coming days, or decrease.