MotorPitchAnalyzer is an app that measures the rotation speed of small motors in real time.
Easy measurement by simply bringing a small motor close to the smartphone's microphone!
The measurement accuracy can be improved by narrowing down the measurement range.
On the screen, the maximum rotational speed of the motor measured from the stable motor rotational speed and frequency intensity is displayed.

By checking the motor sound waveform in real time, it is also possible to easily check shaft vibration and brush condition. *This is just a guideline.

Please measure in a quiet place as much as possible as the recording will be done using a microphone. Also, the measurement results may differ slightly depending on the microphone performance of the Android device being measured. please note.