DeviceCheck / Mouse scroll wheel test
Browser diagnostic
Mouse scroll wheel test
Scroll up and down inside the test area. Each wheel event is counted separately.
● Runs locally in this browser.
What this means
Run the test to interpret your result
Your result will be explained here, including what is normal, what may indicate a problem, and the most useful next step.
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Recommended hardware
Contextual replacement recommendation
Reserved for a relevant product recommendation when a result suggests a hardware issue.
View options →Scroll here
The page will stay still while the test area captures the wheel.
Up events0
Down events0
Raw distance0
Waiting for wheel input.
What to look for
Slowly scroll several notches in one direction. If the opposite counter jumps without you reversing direction, repeat the test. Erratic direction changes can be a sign of wheel encoder wear, though trackpads and smooth-scrolling devices behave differently.