Desktop-like device detected.
Touch Screen Test
Tap and drag across the grid. Coverage, dead zones, and possible ghost-touch signals are measured from your actual touch events.
StatusReady
Time limit: 12s
Coverage
0.0%
Possible ghost signals
0 observed
None yet
Fullscreen is requested automatically for accurate edge testing.
Begin the test
Start, then tap/drag across the entire surface.
(Grid size and ghost heuristics use local heuristics only.)
Test settings
Tuning affects resolution and dead-zone sensitivity.
How we identify possible dead zones
Cells with fewer than 1 distinct visits are marked as possible dead zones. This may simply mean the area was not covered during the test.
Ghost touch heuristics
These are heuristic-based observations, not hardware diagnoses. Browser APIs cannot definitively detect hardware faults.
- Possible unintended re-touch within 350ms at micro-delta ≤ 0.006
- Possible micro jitter: short time & small normalized delta
- Possible repeated small area: ≥5 touches in same cell within 800ms