Pedometers are used to count the number of steps that a person walks. Those steps are often converted to distances, often by calibrating the pedometer. High school and college running tracks are typically either 400 meters in length or 440 yards in length. Use such a track with a known length and conduct an experiment to test the accuracy of a pedometer. Some pedometers are inexpensive, such as less than $1. Others, such as a Fitbit, are much more expensive. Also, there are free smartphone apps that can function as pedometers.