Try to measure RPM?

It is a measure of the application the number of revolution of the motor that was created as (Mini-Z for) radio control.
• The main function
And measurement of the rotational speed

• How to use
· Tap the "Start"
· Turn the motor
· Approach the motor to the microphone
· Rotational speed is measured
• Notes
· Noise is large, it may not be recognized well
Will be easier to (5 or 10 times the average) recognition When you change the "Boundary value setting", but becomes easier if mistaken.