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It sounds like you are referring to a pedometer. These things basically count footsteps or strides. The purpose is usually to infer distance walked or hiked, although there is some error in going...
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#1: Attribution notice removed
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System
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2020-06-03T15:54:22Z (almost 4 years ago)
Source: https://outdoors.stackexchange.com/a/14425 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/