Addison Technology professional trackball
![addison technology professional trackball 33255](itb/addison_technology_professional_trackball_33255.jpg)
Ball diameter: 51 mm [see Trackball Ball Replacement]
- Ball weight 3 oz
- Ball diameter 2 inches
- Sensing Mechanical
- Resolution 300 dpi
- Tracking speed Up to 600 mm/s
- Interface 9-pin serial (RS-232 DE9)
- Price $15 (1994)