Tilt first, then hold the target
Start the sensor check from the button, allow motion access if prompted, and gently tilt the phone left/right and forward/back. Once changing orientation values have arrived, guide the ball toward the center and hold it there briefly.
The displayed alpha, beta and gamma values are browser-provided orientation angles. They can be derived from several sensors. This tool cannot identify which physical gyroscope or accelerometer contributed, calibrate it or test compass accuracy.
No events is different from a level phone
A still phone can legitimately report zero degrees. A browser that delivers no events has not provided a test result. Desktop computers and restricted browsers often cannot expose useful motion readings even though the interface exists.
- No values after tilting: check permission and try the page directly in a compatible mobile browser rather than an embedded app browser.
- Values change but the target is hard to hold: set the phone on a stable surface and compare its resting values. Hand movement and browser sampling can add apparent jitter.
- App rotation also fails: check orientation lock and compare a native app. A failure in one browser alone is insufficient evidence for repair.
Orientation listeners stop after the exercise or when the page is hidden. Values stay local; the saved summary records observed events and the exercise outcome. The compatibility notes explain unsupported readings. Use the touch test separately for gesture input; tilting is a different input path.