Abstract: An electronic device that automatically counts and measures power of the impacts of a tennis ball with a tennis racket during play. The housing of said device comprises a mounting apparatus which is mechanically configured so that a player using said device will be able to easily mount said device on a tennis racket or on the player's arm. Said device is electronically configured so that a player using said device is able to keep a count of the type of tennis strokes that are struck by the player during the course of play. Said device is further configured so that it is able to count the total number of strokes hit by a tennis player. Said device is further electronically configured so that a player using said device is able to determine the amount of force that a tennis ball makes against a tennis racket with each contact with a tennis ball. Said device is further configured with a display that will allow for a player using said device to read information provided by said device.