QuickDeviceTest Device test / Double click test
Double click test
Single-click at a normal pace 20–30 times with each button. If your mouse sneaks in an extra click, the page catches it and shows how many milliseconds after the release it fired.
Single-click here, normally, 20–30 times
Left, right, middle (wheel), back and forward
Reading the result
No amber flags after 30 single clicks: the switch is fine. One or two flags: repeat slowly; an occasional flag at 70–80 ms can be your own finger. Repeated flags under 40 ms: the switch is bouncing, and the problem will usually get worse over time.
The same fault shows up as dragged files dropping early, text selections letting go, or a single click opening two tabs. Check the right button too; it wears less but is not immune.
Before you blame the mouse
- Windows: Settings > Bluetooth & devices > Mouse > Additional mouse settings: check that "ClickLock" is off and double-click speed is not at the slowest setting.
- Test on a second computer or with the mouse's software closed to rule out a macro.
Questions
Why does my mouse double-click when I click once?
Mouse switches have metal contacts that bounce when they close. Firmware waits a few milliseconds to ignore the bounce. As the switch wears or oxidises, the bounce lasts longer and the mouse reports a second click. It is common on older mice and some models with known switch issues.
How does this test detect it?
It times the gap between releasing a button and pressing it again. A person can't realistically re-press in under about 60–80 ms; a bouncing switch often "re-presses" in 5–40 ms. Those presses are flagged in amber.
I got flagged when I double-clicked on purpose. Is that wrong?
Very fast deliberate double-clicks can land near the threshold. Test with single clicks at a normal pace; a faulty switch will still produce flags. You can also change the threshold to 60 ms.
Can I fix a mouse that double-clicks?
Short term: some manufacturer apps offer a "debounce time" setting, and blowing compressed air into the switch can help. Long term: replace the switch (with soldering) or claim warranty. Many brands replace mice with this fault.