Mouse tester: buttons, scroll wheel and double clicks
Move over the pad and click every button, scroll the wheel and watch the counters. The tester shows which buttons register, how fast you can click and whether one click ever registers twice.
What the mouse tester checks
A mouse has more parts than most people notice: a left and right button, a wheel that scrolls and clicks, often two thumb buttons and a sensor that tracks movement. This tester asks the browser which button was pressed on each click and counts the results, so you can see that every switch actually registers instead of guessing from a game.
The scroll counters separate wheel up from wheel down, which catches a wheel that skips or scrolls the wrong way. A double click counter shows when two clicks were detected, which helps you find a button that registers twice from a single press. Click speed is measured over bursts of three clicks.
Mouse buttons and what they are called
Browsers report each button by number. This is how the tester labels them.
| Button | Browser number | Typical use |
|---|---|---|
| Left | 0 | Click, select, fire |
| Middle (wheel click) | 1 | Open links in a tab, extra bind |
| Right | 2 | Menu, aim, secondary fire |
| Back (side) | 3 | Go back, extra bind |
| Forward (side) | 4 | Go forward, extra bind |
Mouse double click and other common faults
The most common mouse failure is the double click fault, where one press registers as two. It usually comes from a worn microswitch, and it shows up as dragging files that drop by themselves, spells that fire twice or selections that vanish. Click once on the test pad at a normal pace. If the double click counter climbs when you only press once, the switch is wearing out. Cleaning rarely fixes it, but many mice allow the switch to be replaced.
A scroll wheel that jumps backwards is usually dirt or a worn encoder. Blow compressed air into the wheel gap and test again. If a thumb button never registers, check the driver software, because many mice can remap those buttons to other functions.
Sensor, sensitivity and next steps
The sensor is harder to test in a browser, since browsers deliver pointer movement at the speed of the display, not the speed of the sensor. The pointer events per second figure here helps you spot a very jerky or dropping sensor, but it is not your polling rate. For true polling rate use the maker software or a dedicated tool.
Once the buttons are fine, tune the feel. Use the sensitivity converter to match your settings across games, work out your pad size with the mousepad size calculator and practise on the aim trainer.
How to use the mouse tester
- Move the pointer onto the test pad.
- Click with every button your mouse has and watch the cells light up.
- Scroll the wheel up and down and check each counter rises.
- Click once at a normal pace to see if a double click is detected.
- Click Reset counters to test another mouse.
Common mistakes to avoid
- Testing with the pointer outside the pad, so events go to the page.
- Reading the pointer rate as the mouse polling rate.
- Replacing a mouse for a double click that is really a driver or setting.
Related tools and guides
Keep going with these: Keyboard tester, click speed test, mouse sensitivity converter, Mousepad size calculator, best graphics cards guide.
Frequently asked questions
How do I test if my mouse buttons work?
Move over the test pad and click each button. The matching cell lights up and counts the clicks. If a button never lights, try cleaning it, checking the driver software or testing the mouse on another computer. Thumb buttons only appear when the mouse has them.
Why does my mouse double click by itself?
A single press registers as two clicks, usually because the microswitch under the button has worn out. Test it here by clicking once and watching the double click counter. Some mice allow a replacement switch, and warranty covers it on newer ones.
How do I fix a mouse wheel that scrolls backwards?
Dirt or a worn encoder is the usual cause. Blow compressed air into the wheel gap, roll it repeatedly and test again. If it persists the wheel part is worn. Check the scroll direction in system settings first, because it can be inverted.
What is mouse polling rate?
Polling rate is how often the mouse reports its position to the computer, usually 125, 500 or 1000 times per second, and up to several thousand on some gaming mice. Browsers cannot measure it exactly, so use the maker software for a true figure.
Is this mouse test private?
Yes. The test runs in your browser, counts clicks locally and sends nothing anywhere. Close or reload the page and the counters reset. No sign-up, download or permission is needed to run it. It never asks for access to your files, camera or microphone either.
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