Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Is it possible for GfxTablet to tell me if my device is capable to sense the pressure?
No, Android always reports a pressure (but a constant value if your display doesn’t support pressure).