I bought mine off ebay and it works great. This is the one i have, and it reads, resets codes, and has an instrument function.
http://cgi.ebay.com.au/U381-LIVE-DAT...item3f03c7dd33
And BTW as this is a Sticky I will be removing some of the questions and comments in the near future. Please make sure you ask questions like this in the KJ forum general section and not add to Sitcky that have informational purposes.