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Scroll wheel test

Scroll in a test box and the tool counts steps per direction, flags wrong-direction stray ticks from a worn encoder, and reports delta units and step size.
Scroll inside this boxThe first wheel tick starts the runThe box scrolls so your page does not have to

Scroll in the box above, then press Score this run.

The classifier only calls a tick stray when a reversal lands inside the window and the wheel then returns to the direction it had before, so changing your mind about which way to scroll never counts. Everything is counted in this tab from the events the browser hands over: nothing is uploaded, and no verdict here is a repair order. A wheel that fails this test can still be working as the manufacturer designed it with free-spinning or high-resolution modes, which produce big steps and dense ticks by intent.
Options

More device tests

- Click speed test (/device/click-speed-test)
- Keyboard test (/device/keyboard)
- Touch test (/device/touch)
All device tests (/device)

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Canonical HTML: https://nutter.tools/device/scroll-wheel-test
Markdown version: https://nutter.tools/device/scroll-wheel-test.md
Plain-text version: https://nutter.tools/device/scroll-wheel-test.txt
Agent index: https://nutter.tools/llms.txt