Surface Acoustic Wave (SAW) technology uses ultrasonic waves to register the touch. SAWs are circulating along the panel and when a soft material touches the screen an amount of the SAW gets absorbed by it. This can be detected and the exact touch point measured. SAW touch kits offer superior image clarity, high resolution, good quality light transmission and great durability. Scratches on the surface don’t affect the touch capacity, but water droplet, oil or other contamination can have a negative effect.