Can't remember which one I got for a friend, about $15 off eBay, but I think the significant thing was that it had a little toggle switch. You can look at the Forscan forums for recommendations with at least pictures of what your looking for. Bluetooth to tablet may be an option also, but I haven't done that. It's nice to see the little bar graph on a laptop plotting different sensor readouts; the only way to do that in non-OBD cars before 96 is with a breakout box for the EEC-IV, or a TwEECer RT - $450. Similar situation with a "transistor tester", there's about 20 different clones from China, you've got to look at the pictures and gamble a little bit.