How to use the mouse test
- Click test: Click inside the mouse picture. Left and right clicks each light up their button and add to their own counter. One click should add exactly one.
- Scroll wheel: Scroll over the mouse picture. The wheel animates, the Scroll counter goes up or down with direction, and the /s figure shows how fast you're scrolling.
- Delta Movement: This graph shows how far the cursor moves between samples, with X in red and Y in blue. Smooth movement makes smooth curves.
- Cursor Position: This panel tracks where your cursor is in the window, so you can check that it can reach every edge.
- Reset: Press Reset to zero the counters and start again.
Diagnosing mouse problems
- Double-clicking: Click slowly, one click at a time. If a counter sometimes jumps by two, the button's switch is wearing out (often called switch chatter). This is very common on older mice.
- Scroll wheel skipping: Scroll slowly in one direction. If the Scroll counter ever moves the wrong way, or jumps around, the wheel's encoder is worn or dirty.
- Jumpy cursor: Spikes or gaps in the Delta Movement graph while you move smoothly point to a dirty sensor, a bad surface, wireless interference, or a failing mouse or touchpad.
- Lag or freezing: Flat lines in the graph while you're moving show moments where the computer didn't receive any movement.
- Speed and acceleration: If the cursor feels too fast, too slow, or inconsistent, the graph helps show whether it's the hardware or your pointer speed and acceleration settings.
- Working device: Smooth, precise movement, one count per click, and the scroll wheel always counting in the direction you turn it.
- Malfunctioning device: Jumpy or drifting movement, flat lines while moving, counters jumping by two, or clicks and scrolls that don't register.
Common Mouse Problems & Solutions
Erratic cursor movement or lag
- Surface: Try a different mouse pad or surface. Optical mice can struggle on very reflective, glass, or uneven surfaces.
- Sensor obstruction: Clean the mouse sensor with a dry cotton swab or compressed air.
- Wireless interference or battery: Check the batteries and make sure the receiver has a clear line of sight. Plugging the receiver into a front USB port or extension cable can help.
- System load: High CPU usage can affect responsiveness. Close unnecessary applications.
- Drivers: Update or reinstall your mouse drivers.
Buttons not working or double-clicking
- Physical wear: Mouse switches wear out over time. This is the most common cause of accidental double-clicks and missed clicks.
- Software settings: Check your operating system's mouse settings for double-click speed and button swapping.
- Debris: Dirt can get into the button mechanism. Try cleaning around the buttons with compressed air.
- Driver or software conflict: Rarely, other software can interfere with clicks.
Scroll wheel not scrolling or jerky
- Debris: Clean the scroll wheel with compressed air while turning it.
- Drivers: Make sure your mouse drivers are up to date.
- Application specific: Some applications have their own scroll settings or behaviors. If it only happens in one app, check there.
Mouse not detected
- Connection: Re-plug a USB mouse or re-pair a wireless mouse. Try a different USB port.
- Batteries (wireless): Replace or recharge the batteries.
- Drivers: Check Device Manager (Windows) or System Information (macOS) to see if the mouse shows up.
This mouse tester is a great first step in troubleshooting any pointer or click-related problems.
Frequently asked questions
Why does one click count twice?
That usually means the button's microswitch is worn. Try the mouse on another computer to rule out software settings. If it still happens, the switch or the mouse needs replacing.
Does it test the middle and side buttons?
Not yet. The counters cover left and right clicks and the scroll wheel.
Does it work with a trackpad?
Yes. Movement, clicks, and two-finger scrolling all register.