Cell size:
Checking finger count? Read the multi-touch test guide Failed grid or ghost watch? Open the ghost touch repair guide
Pre-flight checklist (read before testing)
  • Unplug the charger - charging noise is the most common cause of fake ghost touches.
  • Remove thick screen protectors and magnetic cases before judging the digitizer.
  • Lay the device flat on a table and clean the glass.
  • Keep your palm off the screen edges while sweeping the grid.
Touch here to start
Live Pen Pressure Tester

Draw with a compatible stylus. The tool separates analog pressure from the constant 0.5 pressed-state value commonly reported by a mouse.

Start pen test
Waiting for pen input

Use a pressure-sensitive pen and draw a slow straight diagonal, then vary pressure from light to firm. Mouse input is accepted only as a limited fallback.

Guided capability check

  1. Detect a real pen pointerWaiting
  2. Reach light and high pressureWaiting
  3. Move the pen through a tilt rangeWaiting
  4. Finish one deliberate straight strokeWaiting
Draw a straight diagonal for wobble evidence, then make light-to-firm strokes for the pressure curve.

Hold the pen steadily in contact for about one second.

Pressure curve and stroke evidence

Recent pressure history

Pressure distribution
Light-touch reach--
High-pressure reach--
Steady-hold pressure jitter--

Straight-stroke evidence

Draw one deliberate straight stroke with at least eight samples.

Line deviation (RMS)
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Maximum deviation
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Local jitter estimate
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These pixel values describe the path delivered to this browser. Hand movement, zoom, display scaling, driver smoothing, and browser sampling all affect them; they are not a hardware pass/fail verdict.

Recent samples

Time Pressure Tilt X Tilt Y Twist Buttons
No pen samples yet.

All measurements stay in this browser. Exports contain only this session’s pointer measurements and browser capability flags.

A browser cannot read raw tablet firmware or electrical sensor data. A missing field usually means the browser or driver did not expose it, not that the pen is defective.

⌨ Free Touch Screen Test by KeyboardTester.click