This tone generator app produces a continuous tone. The user can modify both the frequency (~pitch) (0 - 20,000 Hz) and the amplitude (~volume) of the sound wave. The wave shape can also be modified as sin, square, triangle, and saw-tooth.
This app can be used in science education in conjunction with a sound meter to determine the inverse-square law for sound intensity, or with another tone generator to produce audible beats (by combining two tones of slight different frequencies).
If you have any questions, comments, or would like to see modifications/updates, please email me at email@example.com