Test audio equipment and generate reference tones with this free online frequency generator. Select frequencies from 20 Hz to 20 kHz and choose from sine, square, sawtooth or triangle waveforms. Stereo and individual left or right ear output make it useful for headphone testing, speaker checks, music tuning, room acoustics and audio troubleshooting from any modern browser. https://aitoolspros.com/tools/calculator/percentage-calculator/