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A large grey trackball with a 55mm ball, four buttons and a scroll ring

Kensington

Kensington Expert Mouse Optical Trackball 55mm

SKU CH-T0WQ-Y29BE

A wired trackball with a 55 mm ball, four programmable buttons and a scroll ring for precise cursor control

  • Product typeMouse
  • Smooth, accurate cursor control with DiamondEye optical tracking on a large 55mm ball
  • Four customisable buttons configured through TrackballWorks software for personalised workflow
  • Award-winning Scroll Ring enables fast scanning of long documents and web pages
  • Wired connection provides reliable, lag-free operation for continuous productivity
  • Over 20 years as the industry standard trackball design trusted by professionals

Product Identity

The Kensington Expert Mouse is a wired optical trackball designed for professionals who want precise cursor control without moving the whole device across a desk. Its stationary form factor suits users with limited workspace or those who prefer a fixed hand position during long sessions.

Optical Tracking Limits

DiamondEye optical tracking follows tiny flecks embedded in the 55 mm ball to translate motion into cursor movement. The sensor relies on surface contrast, so performance can degrade on highly reflective or transparent surfaces and the ball must be kept clean to maintain consistent accuracy.

Ball Diameter Decides Fit

The single specification that determines suitability is the 55 mm ball diameter. This size dictates the finger span and rolling force required; users with smaller hands or a preference for finer fingertip control may find the larger sphere less comfortable than smaller trackball alternatives.

How it compares

Measured against everything we stock in Wireless & Ergonomic Mice, at today’s prices. Recalculated every night.

Price $58.99
Pricier than about 79% of the 403 comparable items (median $25.99).

Specifications

Product
Brand nameKensington
Product typeMouse

Questions about this item

Should I choose the 55mm ball or a smaller size for precision work?

This model only comes with the 55mm ball; DiamondEye optical tracking reads embedded flecks on that sphere for smooth cursor control.

How does the 55mm ball feel during daily desktop use?

The large sphere lets you move the cursor across multiple monitors with minimal hand motion, reducing wrist strain during long sessions.

What connection does the Expert Mouse use and what does it limit?

It is a wired USB trackball, so cable length sets the placement range and no battery charging is required.

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