DT225 Trackball

By Xah Lee. Date: .
dt225 trackball-s
CH Products DT225 trackball, and the ITAC Mouse-Trak Trackball, are the most smooth trackball. 3264×2448image source

You can find DT225 Trackball online, going for about $300.

CH Products DT225 USB trackball

see also ITAC Mouse-Trak Trackball

Alternatives

If you don't want to spend few hundred dollars, your best bet is probably

Kensington Slimblade trackball 78432
Slimblade
Kensington Expert Mouse trackball wireless
Kensington Expert Mouse
CST25455W glow trackball
L-Trac

see also Best Trackballs 2016