Double Click Test
Click once at a time. If one press shows up as two, the switch is wearing out.
Click here, one press at a time
Ready.
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How to use this test
The double click test catches a mouse that double-clicks on its own. It times the gap between every two presses of the same button. Two presses that arrive within about 30 milliseconds most likely come from the switch contact bouncing; Linux's input system, for example, treats a re-press within 25 ms as bounce. This is called chatter, and it is the usual reason a mouse starts double clicking.
Choose the button to test, then click it slowly inside the test area, about once a second. The last ten gaps appear in the list. Then press and hold the button for a second before letting go. A healthy switch shows one press per click and no flicker while you hold it.
What the results mean
Gaps of 30 ms or less are marked as chatter, the likely sign of a bouncing switch. Gaps above 30 and up to 80 ms are marked as suspicious, because they can be chatter or a very fast double click made on purpose. When you click slowly, any chatter mark points to the switch, and marks tend to become more frequent as it wears. Windows treats two clicks within 500 ms as a double click, so slower gaps count as separate clicks.
Common questions
How do I fix a mouse that double clicks?
Some mouse software has a debounce setting that ignores the extra bounce. Most gaming mice ship with a debounce of about 5 to 10 ms, and raising it can hide the problem for a while. Cleaning rarely helps a worn contact. The lasting fix is a new switch or a new mouse, and if the mouse is under warranty, a screenshot of this test is good evidence.
Is it my mouse or my Windows settings?
If this page shows two presses with a very short gap, the mouse sent two presses. That's the hardware. The double-click speed setting in Windows only changes what counts as a double click, not how many clicks the mouse sends.
Why does it only happen sometimes?
Chatter starts off intermittent and gets more frequent as the contact wears. Do a hundred slow clicks; even one or two orange marks are worth keeping an eye on.