Simply swipe your finger on the controller clockwise or counterclockwise to raise or lower the tone frequency.
Clear Wave - Speaker app
Tone Generator: Sound Meter
Clear Wave – Speaker app lets you create pure wave tones at frequencies from 50 Hertz to 30.000 Hertz and track environmental noise around you.
Tone generation is needed for checking acoustics, testing hearing, tuning of musical instruments, science experiments, testing sound equipment, etc.
Control the volume, frequency and waveform in the real time.
Great variety of waveforms: Sine, Square, Triangle, Saw Up, Saw Down.
Take photos from the camera with the overlay of information about the noise level, time and date.
App can turn your phone into a professional sound level meter, precisely measures the sound pressure level all around you, detects harmful environmental noises, and helps to protect your hearing.