SoundTesterBy tm-laboratory ( Free )
You can play for the length of the specified sound of a specific frequency.Frequency (Hz) = {"20", "25", "50", "100", "200", "300", "400", "500", "750", "1000", "1250", "2500", "5000", "7500", "10000", "12500", "15000", "16000", "17000", ...