Regular size for SAW touch screen as below (inch) : 8.4 14 15 17 18.5 19 20 21.5 22 23.1 23.6 24 26 27 32 ; Key Characters of SAW Touch screen : 8-32 inch SAW touch screen panel; CE,FCC,RoHS certification; 5V / 12V USB,RS232 is optional; Support Windows,Linux,Android system; IP 65 Waterproof,Dustproof, Vandalproof ; Anti-glare, Anti-shock , Anti-scratch; >92% Light transparency; High resolution, 4096 x 4096; Free-drive,flat surface; Aluminum / Plastic frame ; Anti-scartch,anti-jam,anti-shock; Multi-touch points available; Clarity image,no drift,no blind spot; Tempered glass,competitive price; Compatible with all SAW controlle; Pure electronic transparent glass; High position accurancy; Adjusted touch force; Durable , Moh's 7 hardness; Product Catalogue : SAW / Infrared / Capacitive / Resistive Touchscreen ; SAW / Infrared / Capacitive / Resistive / Nano Foil  Touch Monitor; All in one touch computer; Indoor/Outdoor Advertising display board; Education All in one  Whieboard; Self-service Multi-media Kiosk;