DT225 Trackball
By Xah Lee. Date: . Last updated: .
The ITAC Mouse-Trak Trackball
and the
DT225 are the most smooth trackball. That is, they can spin.
[see Trackballs That Can Spin]
You can find DT225 Trackball online, going for about $300.
see also
ITAC Mouse-Trak Trackball
Ball Size
DT225 trackball ball diameter is ~57 mm