Use the control wheels to set the desired frequency. Press "Start" to generate the tone. The ton is played until "Stop" is pressed.
The last created frequencies are added into the list. The selection of a frequency adjusts the frequency again. If the tone generation is active, the new frequency is immediately audible.
The frequency range of your smartphone or tablet speaker is rather limited. Better results and a better frequency range can be achieved if external speakersare connected .