How to use the double click test
- Speed: double-click the box to see the gap between your two clicks in milliseconds.
- Fault check: click slowly, about once a second, with the button you want to test.
- Any click that registers twice within 80 ms is flagged as suspicious.
Why a mouse double clicks by itself
When a mouse switch wears out, its metal contacts can bounce and send two clicks for one press. This is called switch chatter. Folders opening when you only meant to select them and drags that drop halfway are typical signs. A new switch fixes it, so check your warranty first.