and if I can't trust the distance/rate/effort it's useless to me

Does not measure step distances accurately AT ALL. I use this while running on a measured track, and not only are the distances totally off, but so is my time per mile and heart rate. It works okay as a regular pedometer I think, but if you intend to use this for exercise, buy something else. Will be returning as I bought this specifically to use while on long runs, and if I can't trust the distance/rate/effort it's useless to me.

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