measure of distance
Distance: interval separating two points in space.
pedometer 
Device that counts the number of steps taken by a walker or runner to measure the distance traveled.
case 
Outer covering that encloses and protects the device’s mechanism.
clip 
Metal fastener for attaching the pedometer to a belt or article of clothing.
step setting 
Button for adjusting the average length of a step in the walk or run.
distance traveled 
Number of steps taken by the walker or runner converted into miles.