1. A testing appliance for testing operation of an acoustic device that generates beams of acoustic energy, the testing appliance comprising: an imaging array for generating electrical signals in response to impinging receipt of acoustic energy; an acoustic-energy direction system disposed to focus acoustic energy onto the imaging array; and a controller electrically coupled with the acoustic device and with the imaging array, the controller having instructions to generate an image on a display from electrical signals received by the controller from the imaging array, wherein: the electrical signals are received by the controller in response to generation of a beam of acoustic energy by the acoustic device; the beam of acoustic energy is directed towards the acoustic-energy direction system; and the image provides a representation of the beam of acoustic energy.