Mouse Wheel Test - Scroll Direction Check - Wheel Diagnosis
A free online tool to test your mouse wheel (scroll wheel) in your browser. Displays scroll direction (up, down, left, right), count, and deltaY values in real time. Use it to check for wheel malfunctions, reverse scrolling, skipping, or unresponsive scrolling.
#1Wheel Detection Area
Hover your mouse over the area below and scroll the wheel. Scroll direction and values are detected in real time.
Scroll the wheel here
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↑ Up0
↓ Down0
What You Can Check
Direction Check -- When you scroll up, the display should show "Up", and scrolling down should show "Down". If the opposite direction appears, there may be a settings issue or a hardware malfunction.
Skip Check -- Slowly scroll one notch at a time and verify that each notch is detected. If some notches are not registered, the wheel sensor may be dirty or faulty.
deltaY Value Check -- Normally, one notch produces a value of approximately +/-100 (varies by browser/OS). If the values are extremely large, small, or unstable, it may indicate a problem.
Skip Check -- Slowly scroll one notch at a time and verify that each notch is detected. If some notches are not registered, the wheel sensor may be dirty or faulty.
deltaY Value Check -- Normally, one notch produces a value of approximately +/-100 (varies by browser/OS). If the values are extremely large, small, or unstable, it may indicate a problem.
Frequently Asked Questions (FAQ)
Q. What if the wheel scrolls in the wrong direction?
A. The scroll direction may be reversed in your OS settings. On Windows, check the mouse settings. On macOS, check the "Natural scrolling" option.
Q. What if the wheel sometimes doesn't respond?
A. The wheel encoder may be dirty or worn. Try cleaning it with compressed air. If the issue persists, consider replacing the mouse.
Q. Is horizontal scrolling detected?
A. If your mouse has a tilt wheel, left and right scrolling will also be detected and displayed. Some browsers also register horizontal scrolling when you hold Shift while scrolling the wheel.