Mouse Double Click Test
Check whether your mouse registers one physical click as two. Click the pad below at a normal pace: the test times the gap between presses and flags any too close together to be intentional — the tell-tale sign of a worn switch “chattering” a single click into a double.
Left-click this pad at a normal, single-click pace.
Click the pad a few times to begin.
Click log
most recent firstNo intervals yet — click the pad twice or more.
Double-click chatter is a hardware fault where one press of a mouse button registers as two clicks. As the micro-switch under the button wears or collects dirt and oxidation, its contacts bounce instead of settling cleanly, so a single press makes, breaks, and re-makes the circuit. Firmware is meant to filter that bounce out for a few milliseconds (a delay called debounce), but on an ageing switch the bounce outlasts the filter and the mouse reports two clicks.
This test catches chatter by timing your clicks. Each press of the selected button gets a high-resolution timestamp, and the tool measures the gap to your previous press of the same button. A gap of only a few milliseconds is impossible to produce by hand, so any interval under the chatter threshold is flagged as a likely misfire. Because the check is live, you can drag the threshold slider afterwards and watch the flags update. Everything runs locally in your browser — no clicks leave your device.
A deliberate double-click almost always leaves a gap above roughly 120 ms, close to the window operating systems use to pair two clicks. Chatter is far faster — usually under 50 ms, often single digits — because it comes from electrical bounce, not muscle movement. That is why a threshold of 50–80 ms separates the two cleanly: real double-clicks sit above it, chatter well below. One stray flag can be noise; repeated flags in the low tens of milliseconds mean the switch is failing.
Typical click intervals
| Interval | Typical source | What it means |
|---|---|---|
| Under 10 ms | Electrical contact bounce | Almost certainly chatter — no hand clicks this fast |
| 10–50 ms | A worn or dirty switch | The classic chatter range; very likely a misfire |
| 50–120 ms | Severe chatter or elite-speed clicking | Grey zone — repeat the test at a slower pace to be sure |
| 120–500 ms | An intentional double-click | Normal — inside the usual OS double-click window |
| Over 500 ms | Relaxed single clicks | Normal single-click pace |
How to fix a chattering mouse?
- Confirm the fault — run the Mouse Tester to check every button, so you know the chatter is isolated to one switch before opening anything up.
- Raise the debounce time — some mice and third-party utilities let you increase it, masking mild chatter without hardware work.
- Clean the switch — work a few drops of contact cleaner into the button and click rapidly to clear oxidation off the contacts.
- Replace the switch — the reliable long-term fix is desoldering the worn micro-switch and soldering in a fresh one.
- Use the warranty — if the mouse is still covered, chatter is a recognized fault and usually grounds for a replacement.