Double Click Test — Is Your Mouse Switch Chattering?
A worn or dirty switch can send two clicks from a single press — the notorious double-click issue. This test records the time gap between every pair of clicks and flags any second click that lands close enough to be chatter rather than intent.
Quick answer: Click once, deliberately. A healthy mouse sends one click; if the counter shows two clicks with a gap under about 60 ms, your switch is chattering. That is a hardware fault — the usual fixes are a warranty replacement, cleaning the switch, or replacing it with a new one.
Press any button or roll the wheel to begin.
| What counts as chatter | A second click arriving less than ~60 ms after the first, from a single physical press |
|---|---|
| Typical chatter gap | 3–40 ms — far faster than a human double-click (usually 90 ms and up) |
| Most affected switches | Mechanical main-button switches, especially after heavy use or in humid environments |
| What to do next | Re-test on another USB port, then a second computer; if it follows the mouse it is the switch |
How the double click test measures chatter
Each click is timestamped with the browser's performance clock. The page keeps the last ten gaps: normal deliberate double-clicks sit in the 90–400 ms range, while chatter lands under 60 ms and often under 20 ms. Because the measurement is done on the raw click events rather than on a rendered button, it also catches chatter that happens during a drag — the case that a normal click counter misses.
Confirm it before you replace the mouse
A chattering switch usually gets worse over time and is rarely a software problem, but two mistakes are common: pointer acceleration or accessibility settings that turn one click into two, and a browser extension or macro that duplicates clicks. Test in a different browser, then on a second computer, then in the operating system's own mouse settings. If the gap shows up everywhere, the switch is failing.
When to use this test
- Files open, or you select text, when you only meant to click once
- Dragging becomes impossible because a second click fires mid-drag
- You want evidence before filing a warranty claim or asking for an RMA
- You are buying a used mouse and want to test the most failure-prone part