Tests/Encoder Check

Mouse Scroll Wheel Test

Inspect scroll wheel delta step timing, velocity, and isolate mechanical rotary encoder reverse glitching.

Rotary Encoder & Velocity DiagnosticsWheel: Idle
Total Steps0
Live Velocity
0L/s
Peak Velocity
0L/s
Reverse Glitches
0skips
Encoder HealthReady
L
R
ENCODER

Scroll Up or Down Here

Continuous scrolls in one direction will detect loose rotary contacts and reverse step stutter.

TEST ROTARY ENCODER
0 L/sVelocity Gauge250+ L/s
Last Delta: 0 px
Accumulated: 0 px
Scroll Event Stream0 events
Normal ScrollReverse Glitch / Skip
No scroll events recorded yet. Scroll inside the box above to inspect encoder wheel ticks.
Encoder Science

Understanding Scroll Wheel Rotary Encoders

Mechanical Rotary Encoders

TTC / ALPS / Kailh

Mechanical encoders rely on internal metallic wiper pins stepping across a conductive wheel track. Over time, oxidized lube and dust cause phase signal misreads, leading to reverse scroll jumps.

Optical Wheel Encoders

Immune to Glitching

Optical encoders (Logitech G Pro, Razer optical wheels) project an infrared beam through a spoked wheel. Zero physical contact friction prevents reverse jumping completely.

Delta Y Steps

Browser API

Standard notch steps report a deltaY magnitude of ±100 or ±120. Consistent direction without sign reversals confirms encoder health.

Free-Spin Smooth Scrolling

Infinite Scroll

Feature-rich mice (Logitech Hyper-Scroll, Razer SmartWheel) unlock detent tactile tension, enabling high-velocity smooth scrolling across long documents.

Scroll Wheel Diagnostic Frequently Asked Questions

  • Worn or dust-clogged rotary wheel encoders produce noisy optical/mechanical signals, causing reverse scroll jumps during scrolling.