FREQUENCY COUNTER

PROBLEM TO BE SOLVED: To obtain a counter capable of counting the vibration frequency of an arm only by attaching a belt for fitting a body provided with a display part for displaying a counted result, a vibration detection part for detecting vibration and a control part for counting up the vibration detected by the detection part and displaying it as the counted result on the display part to the arm. SOLUTION: This counter has a counter body 11 and a belt 12 for fitting the body 11 to an arm. The body 11 has a display part 13 for displaying a counted result, on objective frequency, plural biguinary marks and plural switches 14a to 14c. In addition, the body 11 is provided with a detection part for detecting vibration, input parts 14b, 14c for inputting the objective frequency etc., a display part 13, a speaker and a control part for controlling these parts. Although the detection part is basically the same as a pedometer, the counter requires higher sensitivity a compared with the pedometer since the counter makes the detection of the vibration of an arm as the purpose.