Quick & easy
I am a professional technician and own more scan tools than I probably should. BlueDriver has become my "first look" favorite because its small enough to carry in my pocket, has a great connectivity rate, and offers clear graphing of major parameters. The only drawback I see is that it wont communicate key-on-engine-off. That limits its usefulness for a no-start or when you want to view data before a start or a restart. I use it daily and like it for what it is: a competent entry-level tool with a few nice extras.
Lusty Sam about
BlueDriver OBD2 Scan Tool