Mouse test

• Five buttons: left, right, middle (wheel click), back and forward, each with a counter that lights up while held.
• Double-click test: checks whether two clicks fall within the threshold you set, the same way your system decides between a double-click and two single clicks.
• Suspicious double presses: a per-button count of presses that arrive faster than a person can click on purpose, the classic sign of a worn switch.
• Wheel: up, down and sideways (tilt wheel), with the value of each step and the scroll mode the browser reports.
• Polling rate: average and peak, with a live graph.
• DPI measurement: your mouse's real sensitivity.

The right-click menu and the browser's back and forward actions are blocked inside the test area, so you can press everything freely.

A very common fault: you click once, but the computer sees two clicks. Files open when you meant to select them, drag-and-drop releases early, and text selections break. The cause is a worn or oxidized microswitch that bounces and closes the contact twice.

To test, click the left button slowly and deliberately 20–30 times. If the suspicious counter climbs even though every click was single, the switch is failing. Check the other buttons the same way; side buttons wear out too.

Fixes range from a warranty claim, to a firmware update or debounce setting in the mouse software, to replacing the switch if you are comfortable soldering.

The polling rate is how often the mouse reports to the computer: office mice commonly use 125 Hz, many gaming mice 500 or 1,000 Hz, and some go higher. In Chrome and Edge, the tool reads the raw mouse events, which gives a more accurate reading, including rates above 1,000 Hz. In other browsers, it estimates from the events the page receives, so the number may read lower than the mouse's true rate.

Move the mouse quickly and steadily in circles for a few seconds. The average shows the sustained rate and the peak the highest burst; dips in the graph while you are still moving can mean a weak wireless signal or a busy USB port. A higher rate makes the cursor feel smoother, mostly noticeable on a high refresh rate monitor; check yours with the refresh rate test.

DPI (or CPI) is how many counts the sensor reports per inch of movement. The value printed on the box or set in the software isn't always what you get. To measure it:

1. Mark a known distance on your desk or mouse pad, for example 2 inches or 5 cm, using a ruler.
2. Start the measurement; the pointer is locked so it can't hit the screen edge.
3. Move the mouse exactly that distance in a straight line and stop.

The tool divides the counts by the distance. In Chrome and Edge it uses unaccelerated raw movement, so Windows pointer acceleration doesn't skew the result. Repeat a few times and use the average. Gamers use this to match sensitivity across mice.

Scroll slowly in one direction. If the down counter occasionally ticks up (or the other way round), the wheel encoder is dirty or worn, which makes pages jump backward. Compressed air into the wheel gap sometimes helps. Push the wheel left and right to test tilt; if nothing registers, check whether the mouse software assigns tilt to another action.

The built-in troubleshooter below the test detects your system and browser and suggests matching steps. The basics:

• Windows 11: Settings › Bluetooth & devices › Mouse for pointer speed, scrolling and primary button. Under Additional mouse settings you find the double-click speed and, on the Pointer Options tab, Enhance pointer precision (acceleration).
• Mac: System Settings › Mouse for tracking and scrolling speed; double-click speed is under Accessibility › Pointer Control.
• Wireless: charge or replace the battery, and plug the receiver into a port near the mouse, not behind the PC or in a crowded hub.
• Jumpy cursor: clean the sensor window and avoid glossy or glass desks.
• Side buttons not working in games: check the mouse software, which may have remapped them.

Testing a whole setup? Use the keyboard test, see how fast you click with the CPS test, or practice accuracy with the aim trainer.