DT225 Trackball

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


• middle, modified SpaceNavigator 3d Mouse with Selectric Typeball
• right, a modified DT225 with LED light.
[image source imgur, by Ripster, 2015-07-09]
