All touchscreens have an IP65 front panel of tempered glass. This makes the front panel of the touchscreen monitors water and dust proof.
The total thickness of the glass front panel is 2.0 mm. You can install a screen protector or anti-reflective film, however it must be a maximum of 2.0 mm thick and must be applied without air between the panel and the film. Thicker film or air between the layers will reduce the accuracy of the touchscreen.