What the result means
When you click deliberately, two separate presses of the same button are rarely less than about 100 ms apart — even a fast intentional double-click usually takes longer. A faulty switch is different: one physical press reaches the computer as two clicks just a few milliseconds apart. The test measures the gap between consecutive presses of the same button and flags every gap below the threshold (80 ms by default).
- No suspicious doubles after 50+ slow clicks — the switch is healthy at the moment. Intermittent faults can come and go, so re-test if problems return.
- One or two doubles — could be an accidental fast double-click. Keep clicking slowly; if more appear, the switch is starting to fail.
- Three or more, or more than about 2% of clicks — a double-click fault is very likely. Gaps of only a few milliseconds are almost certainly the switch, not your finger.
How to run the double-click test
- Point at the test area and single-click the left button at a calm, steady pace — roughly one or two clicks per second.
- Keep going until you have at least 50 clicks. Faulty switches often misfire only now and then.
- Repeat with the right and middle buttons, then try the hold test: press and hold for a few seconds and release.
- Read the verdict, the per-button table and the histogram. Red bars are presses closer together than the threshold.
Why mouse switches start double-clicking
Most mice use small mechanical microswitches (Omron, Kailh, TTC and others). Inside, a metal leaf snaps against a contact. As the contact surfaces wear or oxidize, the leaf can bounce — touching, separating and touching again within a few milliseconds. The mouse's firmware ignores very short bounces with a debounce delay, but once the bounce lasts longer than that window, the extra contact is sent as a second click. A commonly cited contributing factor is that mice run their switches at very low current, which does little to clean oxide off the contacts. Switches with an optical actuation (no metal contacts) are much less prone to this.
Method and limits
Each press is a mousedown event with a high-resolution timestamp. For every button the test records the gap since that button's previous press, flags gaps below the threshold, and plots all gaps up to 400 ms in the histogram. Changing the threshold re-evaluates every press you have already made. The test only sees bounces that get past the mouse's own debounce — which are exactly the ones that cause problems in apps and games.
| Browser | Left / right / middle | Timestamp precision |
|---|---|---|
| Chrome, Edge, Opera | Yes | Better than 1 ms |
| Firefox | Yes | About 1 ms or better |
| Safari (macOS, iPadOS) | Yes | About 1 ms |
How to fix a double-clicking mouse
- Raise the debounce time in the mouse's software if it offers the setting (many gaming mice do), and install the latest firmware.
- Blow out dust with short bursts of compressed air around the button edges while clicking it.
- Claim the warranty if the mouse is still covered — a repeatable result from this test is useful evidence for support.
- Replace the switch if you are comfortable soldering; it is a common repair, but opening the mouse usually voids the warranty.
Frequently asked questions
How do I know if my mouse is double-clicking?
Single-click slowly in the test area 50 times or more. If the test flags presses less than 80 ms apart while you were clicking slowly, the mouse is registering one press as two. Gaps of just a few milliseconds are a clear sign of switch bounce.
What threshold should I use?
80 ms works for most people. If you click very fast on purpose, lower it to 50–60 ms to avoid false alarms; switch bounce usually produces gaps well below that. Raise it only if you want a stricter check.
Can software fix a double-clicking mouse?
Sometimes. Increasing the debounce time in the vendor app can hide mild bounce, and some third-party tools filter fast repeats. These are workarounds — the switch will usually keep wearing.
My mouse drops drags or releases while I'm holding the button. Same problem?
Yes, it's the same wear. When the contact briefly opens during a hold, the computer sees a release and a new press. Use the hold test: press and hold for a few seconds — a dropout appears as a suspicious double.
Does Windows double-click speed affect this test?
No. The operating system's double-click speed only decides how two clicks are interpreted by apps. This test measures the raw time between presses, before any double-click interpretation.
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