Touchscreen Test
Find dead patches on the glass, see how many fingers your screen registers at once, read pen pressure and tilt, and draw a slow line to check the digitizer is smooth. Everything happens inside the pad below and nothing is uploaded.
What a web page can and cannot see
so you know what these numbers are worth- Pressure of exactly 0.5 usually means no pressure sensor. The spec says devices that cannot measure force report 0.5 while down, so a mouse and a plain finger both sit at 0.5 forever. Only a real stylus varies.
- Tilt and twist need a pen. Fingers report zero, which is correct rather than broken.
- maxTouchPoints is a claim, not a measurement. Test 01 counts what actually arrives, which is the number worth trusting.
- Dead zones need patience. Drag slowly over every part of the pad in test 03. A gap in the line is a gap in the digitizer, but a fast flick leaves gaps for ordinary reasons.
Touch here with as many fingers as you can.
Multi-touch
Put as many fingers on the pad as you can and hold them there. Each one gets a circle and its own pointer id. If a finger vanishes while the others stay, the glass is not tracking it.
0Down right now
0Most at once
—maxTouchPoints claims
Touch the pad to begin.
nothing down