Double Click Test

How to test for double clicking

1. Choose the button you want to test (left is the usual culprit).
2. Click inside the box once at a time, with a short pause between clicks. Do 20-30 clicks.
3. Each click adds a bar to the timeline. A green bar is a normal click. A red bar is a second click that arrived within 80 ms of the previous one, which is faster than a human can click on purpose.
4. Try clicking at different speeds and pressures, and hold the button for a moment before releasing, because a worn switch often fails on release.
5. Read the Faulty doubles counter. Press Reset to start again.

What the results mean

Faulty doubles = 0 after 20-30 clicks: your mouse switch is working. If you still get double clicks in Windows, the problem is a setting (see the fixes).

One or more red bars: the switch is bouncing. Each red bar is a click your mouse sent on its own. Even one or two in thirty clicks is enough to drop files, open two windows and mis-fire in games, and it usually gets worse over weeks.

The gap values show the time between consecutive clicks. Intentional double clicks by a person are normally 120 ms or more apart, so anything under 80 ms is treated as a fault. Lower the threshold slider if you are a very fast clicker and want to be strict; raise it if you suspect the switch but see no red bars.

Why does a mouse double click on its own?

Each mouse button has a tiny metal micro switch. Over hundreds of thousands of presses the spring contact wears and oxidises, and instead of one clean "on" it bounces: on, off, on in a few milliseconds. The mouse firmware normally filters bounce for a short window (debounce), but a worn switch bounces for longer than that window and the computer sees two clicks. Dust and static can cause the same thing on a nearly new mouse, which is why cleaning sometimes helps.

This double click test uses the browser's high resolution timer to measure the gap between every mousedown event, so it sees exactly what your games and apps see.

Common problems and fixes

Raise the debounce time in the mouse software

Razer Synapse, Logitech G Hub and many other apps have a "debounce" or "click delay" setting. Raising it a few milliseconds hides light bounce. It is a workaround, not a repair, but it can buy months.

Clean the switch

Unplug the mouse, hold the button half-pressed and blow compressed air into the gap at the front edge. A drop of contact cleaner on a cotton bud near the switch helps with oxidised contacts. Let it dry fully before plugging in.

Check Windows settings if the test shows no fault

If this test is clean but Windows still double clicks, open Settings > Bluetooth & devices > Mouse > Additional mouse settings and lower the "Double-click speed" slider. Also check File Explorer is not set to "Single-click to open an item".

Replace the switch or the mouse

Micro switches cost very little and can be soldered in by a repair shop, or at home if you are handy. If the mouse is under warranty, claim it: double clicking is a well-known fault and most brands replace the mouse.