It is based on sending acoustic waves across a clear glass panel with a series of transducers and reflectors. When a finger touches the screen, the waves are absorbed, causing a touch event to be detected at that point. Because the panel is all glass there are no layers that can be worn, giving this technology the highest durability factor and also the highest clarity. This technology is recommended for public information kiosks, computer based training, or other high traffic indoor environments. Click Here for more information and technical specs for Surface Acoustic Wave touch screens.
Circuits located at corners of the screen measure the capacitance of a person touching the overlay.
Frequency changes are measured to determine the X and Y coordinates of the touch event. Capacitive type touch screens are very durable, and have a high clarity. They are used in a wide range of applications, from restaurant and POS use to industrial controls and information kiosks. High Clarity Not affected by dirt, grease, moisture. Here for more information and technical specs for Capacitive touch screens.