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It depends a lot on what "stride length" the pedometer is calibrated for - it varies a lot.
The word 'pedometer' is a noun, a singular, common, concrete noun; a word for an instrument for estimating the distance traveled on foot by recording the number of steps taken; a word for a thing.
The Romans used an odometer calibrated to steps to measure distances for military and civil purposes, although technically this is not a step counter. The modern all-mechanical pedometer was introduced later to the Americans by Thomas Jefferson. Jefferson obtained a unit from France, but it is not known if he modified the design, or introduced it to the US as is. Although this pedometer is widely attributed to Jefferson, proof is difficult to obtain as he never applied for any patents on any of his inventions. In 1780, Abraham-Louis Perrelet created the first pedometer, measuring the steps and distance while walking.
Pedometers contain motion sensors to help count steps. For each step that is taken, the pedometer shakes a tiny bit with the movement of the walker's body. This movement is registered as a step.
He wore the pedometer to see how far he had walked that day.