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The Surface Acoustic Wave (SAW) technology is one of the most advanced touch screen types. The technology is based on two transducers (transmitting and receiving) placed for the both of X and Y axis on the touch panel. The other important element of SAW is placed on the glass, called reflector. The controller sends electrical signal to the transmitting transducer, and transducer converts the signal into ultrasonic waves and emits to reflectors that are lined up along the edge of the panel. After reflectors refract waves to the receiving transducers, the receiving transducer converts the waves into an electrical signal and sends back to the controller. When a finger touches the screen, the waves are absorbed, causing a touch event to be detected at that point.

Compared to Resistive and Capacitive technologies, SAW technology provides superior image clarity, resolution, and higher light transmission. 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. The Surface Acoustic Wave technology is recommended for ATMs, Amusement Parks, Banking and Financial Applications, public information kiosks, computer based training, or other high traffic indoor environments. Surface wave touch screen panels are the most advanced of the four types. SAW offers excellent clarity and durability and allows gloved hand use. 

8.4"-47"  waterproof SAW touch screen

Features:

The water resistant feature of the products is compliant with NEMA3 and IEC IP65 standards, which can protect the
reflective grating and the transducers from the water and the dust.
Test way:

1. Take the panel Level laying aside, then pour water on it. And keep this condition 24 hours.
2. Spill the water and clean the panel.
3. The touchscreen can work fine.
Excellent maintenance-free and durability
Applicable to the outdoor environment environments where in unsupervised or industrial environments

8.4"-47"  waterproof SAW touch screen