yes i know that but can't really expect an average person to have access to those. Price wise it's too costly to invest. I would love to have them lol but can't afford, i got to fix my car. My dizzy gone bad and trying diagnosing the faults right now. i kinda know this and that lol, i'm a fast learner and always interested in learning new things. i am my own car and cousins, friends mechanics. But also a gardener with green finger, also a great cook :P and DIY kind of guy. Basically i'm all rounder.