The meter is a wideband meter so you can set the idle A/F in real time. I use it for drag racing to record each run to evaluate the A/F vs. RPM. It will record up to approx 80 minutes so just before I stage, I hit the record button. The graph will show you your RPM's (shift points) and A/F for the entire run. I start out adjusting the front jets in the garage by reving the engine to about 3.5k to get the A/F reading for the front only. I want a reading of about 12:1 on the front only then adjust the back to be eight numbers greater. (Vac Sec Carb) The actual run will show your total A/F.(Front and Back combined) Check out there website:
www.innovatemotorsports.com