QuickDeviceTest Device test / Mouse test
Mouse test
Click every button and roll the wheel inside the pad. Counters show what the computer receives, and the page flags presses that come suspiciously fast, the classic sign of a failing switch.
Click every button and scroll here
Left, right, middle (wheel), back and forward
What each readout checks
- Button counters: one press, one count. A count that jumps by two points to a worn switch.
- Fastest release→press: the shortest gap between letting go and the next press of the same button. Human double-clicks rarely get below about 60–80 ms; far faster means the switch bounced.
- Wheel: separate up, down and horizontal counts. A wheel that sometimes scrolls the wrong way usually has a dirty or worn encoder.
Quick fixes
- Wireless mice: fresh batteries and the receiver in a front USB port close to the mouse.
- Clean the sensor window with a dry cotton bud; hair on it causes jumpy movement.
- Glass or glossy desks confuse many optical sensors: use a mouse pad.
Gamer? Measure how often your mouse reports with the polling rate test.
Questions
How do I test my mouse buttons?
Click inside the pad with each button: left, right, middle (press the wheel), and the two side buttons if your mouse has them. Each counter should go up by exactly one per press. Scroll the wheel both ways to check the scroll counters.
My side buttons don't register. Why?
Some mouse software remaps side buttons to keystrokes or macros, which the browser then sees as key presses instead. Reset the buttons to "Back" and "Forward" in the manufacturer's app, or test on a computer without it.
How can I tell if my mouse double-clicks by itself?
Single-click normally. If the page flags a re-press that happened only a few milliseconds after the release, the switch is bouncing. See the dedicated double click test for a fuller check.
Why does the scroll count jump in big steps?
Notched wheels send one event per notch; smooth trackpads send many small ones. The "last wheel delta" readout shows the size and unit of each event.
Does it work with a trackpad or touch screen?
Yes. Taps, two-finger clicks and two-finger scrolling all register. On phones, taps count as the pointer check in the main checklist.