How to test your mouse
- Click each button inside the dashed box: left, right, the wheel, and the back and forward buttons on the side if your mouse has them. Each part of the drawing lights up while it’s held.
- Scroll the wheel up and down. The counters and arrows show every step it reports.
- Click once at a time with the left button. If the test warns that two presses came closer together than the threshold, that button may be double-clicking by itself.
What the test shows
The drawing lights each part of the mouse while it’s pressed and outlines it in green once it has worked. The table counts presses for every button and shows how long you held each one the last time. Under it you’ll find the wheel steps up and down, the number of double-clicks and the gap between the two clicks of your last and fastest double-click.
The log lists the latest events, newest first, so you can see exactly what the mouse sent.
Finding a faulty switch
The most common mouse fault is a worn switch that “chatters”: one press sends two clicks. It shows up as accidental double-clicks, files opening when you meant to select them, or drags that let go on their own.
To check, click the suspect button slowly, many times. A healthy mouse never shows a warning. If you see presses only 10 to 40 ms apart when you clicked once, the switch is probably bouncing. You can raise or lower the threshold if you click very fast on purpose.