How the Double-Click Test Works
Every time you press a button, the test records the exact time and compares it with the previous press of the same button. If the gap is shorter than the threshold (80 ms by default), that click is flagged as a double-click fault.
80 ms is far faster than anyone can click on purpose — a deliberate double-click usually takes 100–200 ms between presses. So when two “clicks” arrive inside that window, they almost certainly came from one physical press.
How to Run It
- Click inside the test area one click at a time, at a normal pace.
- Do at least 50 clicks per button you want to check. Vary your pressure — light presses are more likely to trigger a worn switch.
- Watch Double-clicks found. Any number above zero means the button chatters.
Reading the Results
| Result | What it means |
|---|---|
| No fault after 30+ clicks | The switch is behaving normally. |
| 1–2 faults in 100 clicks | Early-stage wear. You may notice occasional double-opens in your file manager. |
| Frequent faults | The switch is worn. Expect accidental double-clicks and dropped drags. |
| Fastest gap under 20 ms | Classic contact bounce — the switch is physically bouncing. |
What Causes a Mouse to Double-Click
Mouse buttons sit on miniature snap-action switches (often called microswitches). When pressed, a metal leaf snaps against a contact. Every switch bounces for a fraction of a millisecond, and the mouse’s firmware ignores this with debounce logic.
As the switch ages, its contacts oxidise and its spring weakens. The bounce lasts longer than the firmware’s debounce window, and one press reaches the computer as two clicks. Humidity, dust and heavy use speed this up, which is why it’s so common in gaming mice used for years.
How to Fix a Double-Clicking Mouse
- Check warranty first. Chatter is a recognised hardware defect; most manufacturers replace affected mice within warranty.
- Increase debounce time in the mouse software if it has the option. This hides mild chatter at the cost of a few milliseconds of click delay.
- Clean or re-tension the switch. Opening the switch and bending the leaf spring back can work for a while, but needs care.
- Replace the switch. Soldering in a new microswitch is a permanent fix; some modern mice use hot-swappable switches.
- Use optical switches next time. Optical switches detect a light beam instead of metal contacts, so they don’t develop chatter.
Keyboards Chatter Too
The same problem affects mechanical keyboards, where one keystroke types a letter twice. Use the keyboard chatter test to check each key.
Frequently Asked Questions
What Threshold Should I Use?
80 ms is a good default. Humans can't deliberately click the same button much faster than about 100 ms apart, so anything under 80 ms is almost certainly a fault. If you click very fast on purpose (for example in clicker games), lower it to 50–60 ms.
My Mouse Double-Clicks but the Test Shows Nothing. Why?
Chatter is often intermittent and may only appear when the switch is warm or pressed lightly. Click 100–200 times with varying pressure. Also check that Windows' double-click speed or the mouse software isn't turning single clicks into double clicks.
Can Software Fix a Double-Clicking Mouse?
Some mouse software has a "debounce time" setting that ignores a second click within a few milliseconds. Raising it can hide mild chatter, but it also slightly delays clicks. The lasting fix is replacing the switch or the mouse.
Why Do Mice Start Double-Clicking?
Most mouse buttons use a microswitch with metal contacts. Over time the contacts oxidise and the spring weakens, so a single press can make and break the circuit more than once. That bounce reaches the computer as two clicks.
Does This Test Work for the Right and Side Buttons?
Yes. Every button is tracked separately in the table below the test, so you can check right, middle, back and forward buttons as well as left.
Related Tests
- Keyboard Chatter TestTap each key normally and find any switch that types a letter twice from a single press.
- Mouse Button TestClick every button and roll the wheel to confirm each one registers — including the side buttons most tests miss.
- CPS Test – Clicks per SecondClick as fast as you can and see your clicks per second. The timer starts on your first click.
- Mouse DPI AnalyzerSwipe your mouse a known distance and measure its real DPI — not the number printed on the box.
- eDPI CalculatorCombine your mouse DPI and in-game sensitivity into one comparable number, and see how far you move to turn 360°.
- Mouse Polling Rate TestMove your mouse and see how many times per second it reports to your computer — from 125 Hz office mice to 8000 Hz gaming sensors.
Last updated · Part of our mouse tests.