How does an umpire count the balls in an over?

How does an umpire count the balls in an over?

An umpire uses counters to count the balls in each over. He establishes method of counting with which he is comfortable and often uses some object like pebbles as counters separately. He has six counters at the beginning of each over and transfers each counter from the unused ones to the used for every ball. Where there are efficient scoreboards, the umpire does not need to make any other check; he only has to see that every run is recorded. But most often, an umpire has to make his own record of runs. For this purpose simple clickers where each click increases the display by one, is commonly used