http://www.processindicator.com/

A computer controlled device that can display two "analog" values (from 0 to 255), a glowing tube (at one of 5 different levels), and a red light (on/off, or blink).

Discussed here:
http://tech.groups.yahoo.com/group/extremeprogramming/message/123637

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Pictures:

http://www.processindicator.com/img/front_page_box.jpg

http://www.processindicator.com/photos.html

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See other BuildStatusIndicators.