One trade name is Chronomix.. These handy pieces of equipment will record the time and place of each runner as they cross the finish line. It is a sort of printing stopwatch. If you have over a hundred or so runners, they are an absolute necessity. Another system involves the handing out of numbered Popsicle sticks or cards to runners as they cross the finish line. They will then give these to the results crew who then adds their name, age, etc. to the results sheet, which is used for the awards. List your age categories on this sheet ahead of time and just add the persons name to the correct category as they turn in their stick and give the results person their name and age. Make sure your results crew is away from the finish line so runners are not held up. This second system is best for smaller races. In larger races you will want to find a place for your results crew to work where they will not be constantly interrupted with questions.