... 15", 17", 19", 21" touch screen, customer size touch screen. 4-Wire resistive touch screen is the preferred solution for low cost ... Light Transmission: Film +Film>77% Light Transmission: Film +Glass>83% Scratch Resistance: 3H pencil hardness Life Expectancy: Over ... 1mm, 2.0mm, 3.0mm, 5.5mm, Normal Glass, Chemically strengthened glass Chemical Resistance: Alcohol, acetone, grease, and general household ...