Mouse test and double click checker

Click inside the box with every button. The test counts each click and warns you if one click turns into two.

Does my mouse double click by itself?

When the small switch inside a mouse button wears out, a single press can bounce and register as two clicks. That's why files open when you only wanted to select them, or dragging suddenly drops. This test flags any two presses of the same button less than 80 milliseconds apart — faster than a person can click on purpose.

How to run the test

1. Click the left button normally about 30 times inside the box.
2. Do the same with the right and middle buttons.
3. Scroll up and down slowly and check that the counters only move in the right direction.
4. Press the side buttons if your mouse has them.

If you see a warning

• Try another USB port and, for wireless mice, a fresh battery.
• Check your mouse software for a "debounce" setting and raise it slightly.
• If warnings keep appearing, the switch is worn. Use the warranty, or replace the switch if you're comfortable soldering.

Can this test measure DPI or polling rate?

Not precisely. DPI is how many counts the sensor reports per inch of real movement, and a web page only sees the pointer position after your system's pointer speed and acceleration are applied — without knowing the physical distance the mouse traveled, any DPI number would be a guess. The "event rate" shows how many movement events reached the browser per second; it often stays near your screen refresh rate even on a 1000 Hz mouse, so use it only to spot a mouse that stutters or sends very few events.

Side buttons, tilt wheel and dragging

The back and forward side buttons are counted inside the box without leaving the page. A tilting wheel shows up as ← / → counts. Hold the left button and drag across the box to check that a press doesn't drop in the middle of a drag — a common symptom of a worn left switch.

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