Click every button, scroll the wheel and move the mouse inside the box: the test shows which buttons work, flags a switch that double-clicks by itself, counts the wheel and measures the polling rate.
Click every button, scroll the wheel both ways and move the mouse quickly here.
No button pressed
Button
Presses
Too fast
Last held
Left
0
0
–
Middle
0
0
–
Right
0
0
–
Back
0
0
–
Forward
0
0
–
Double-click check
Keep clicking
Scroll wheel
0 up, 0 down
Polling rate
Move the mouse
Side scroll (tilt)
0 left, 0 right
Click the left button at least 20 times at your normal speed (0 so far), then try the other buttons.
ms
How to test your mouse
Press each button inside the box: left, right, middle (the wheel) and the side buttons. Each lights up and is counted.
Click the left button 20 times or more at your usual speed and read the double-click check.
Scroll slowly down, then up, and check that every notch goes the right way.
Move the mouse in fast circles to read the polling rate.
If something fails
A button doesn't light up: try another USB port or fresh batteries; side buttons may be set to another action in the mouse's own software.
Double-click faults: usually a worn switch. Software can't fix it; a mouse under warranty can be replaced, or the switch repaired.
Wheel jumps: dust in the wheel's encoder is a common cause; compressed air sometimes helps.
Polling rate lower than set: check the setting in the mouse's software, and use a USB port on the computer rather than a hub.
Everything runs in your browser; nothing is recorded or sent.
Frequently asked questions
How do I check if my mouse double-clicks by itself?
Click the left button at least 20 times at your normal speed. A worn switch can bounce and register a second press a few milliseconds after the first; the test flags any press that comes within 50 ms of the one before it on the same button. For example, presses at 0 and 18 ms are flagged as one fault, since nobody clicks that fast on purpose.
What should the double-click limit be?
50 ms is the kind of limit online mouse testers use (some use 30 ms): short enough that a quick deliberate double click isn't flagged, long enough to catch a bouncing switch. If you click very fast on purpose, lower it; raise it to be stricter. The last gaps between your left clicks are shown, so you can see how close they came.
Will the back and forward buttons leave the page?
Not while the pointer is inside the test box: the test stops them, and the middle button's autoscroll, so you can press each one. Outside the box they work as usual.
How does the scroll wheel test work?
Scroll inside the box: each notch up or down is counted and the page doesn't move. A jump is a single notch the wrong way in the middle of steady scrolling, which is what a worn wheel does. Tilting the wheel sideways shows under side scroll.
How is the polling rate measured?
Move the mouse quickly inside the box. The polling rate is how many times a second the mouse reports its position; the test times the reports and uses the typical gap. Reports 2 ms apart are 500 Hz. It needs a browser that passes on every report, such as Chrome or Edge.
