Review on Kungfuren Car OBD2 Scanner: Check Engine Fault Analyzer for OBD2 Protocol Cars Since 1996 by James Cypert

As our vehicles get older, problems occasionally arise. We bought this to be able to take simple measurements that will help us not be completely in the dark as to what is causing the check engine light and hopefully get the job done and not be misled as to what really needs fixing. (not that it ever happens). Love the fact that it doesn't require a battery to use, but I had to double-check to get a picture of the problem (I couldn't write it down). I couldn't just turn it on to revoke because it has no power of its own. (my fault)