The Pedometer is a tool from the OpenBlocks mod. It is used, as the name implies, to measure the distance that the player travels. The use key will begin the measurement. When the key is used again, it will display a large amount of data in the chat. It will state the starting coordinate, the speed in which the player walked using meters/tick, the average speed in which the player walked using meters/tick, the total distance in meters, the straight line distance in meters, the straight line speed in meters/tick, the distance from last check in meters, the time from the last check in ticks, and the total time in ticks.
It has a similar use to the Tape Measure from the BiblioCraft mod.