Don't you just love the versatility of the G-Tech meters! I have the G-Tech Pro RR and use it to gauge performance increases and evaluate changes. For anyone that tinkers or would just like to see a quantified performance change, they are great. No more guessing about how much a part did or did not help. And a great way to validate manufacturers claims. 20-25 years ago only NASA and a hand full of others had this much power available too evaluate performance. At right at $300. 00, these performance meters are a bargain. One hour of Dyno time will pay for one of these! The technology is unsurpassed, and pr oven to deliver accurate results time and time again. Actually, this is the same technology that the Military uses to guide it's Missile systems. Anyone reading this that has ever wondered about how accurate and reliable these performance meters are, should lay their fears to rest, these performance meters work and do so accurately and consistently. Spring for the RR version and enjoy.