It's really not that complicated. It's basically an analog scanner broken up into several different items....you know...dinosaur technology. Instead of scrolling through various screens to find a certain function, everything is layed out in front of you. Funny thing is, this stuff can be had for very cheap. On top of that, half the time when I run into this stuff it looks like it was sent to the dealership service depatment, set in a corner and never touched (the Rotunda stuff that is). For some reason those dealer techs did not bother using this stuff. I wish I could figure out why because as far as I am concerned this stuff works great. The only things that really costed me some serious coin was the smoke machine, gas analyzer and the scopemeter. The Rotunda stuff costed me anywhere from 10 dollars to 150 dollers per item.