... dust from accumulating in area that can affect SAW touch screen performance. SpecificationsTechnologySurface Acoustic Wave (SAW)Resolution4096× 4096MaterialPure glassDeviation2mmLight ... without failure.Surface hardnessMohs hardness rating of 7Operating TemperatureTouch screen -20°C to +50°CController: 0°C to ... Altitude3000mCertificationCE,FCC,UL,RoHS,CCCSize15'', 17'', 19'' LCD Touch Screen