This topic is beaten to death. Search through the forum archive. There is more information there you can absorb.
P.s. But I have to admit no one called it "Throttle body balancer" and "AF Meter" yet. You don't want to use those as the search keywords.
I have looked,and remember previous posts too,what I'm looking for is specific brands with pro's n con's and opinions in one area,taught it might be of help to others too,the search is way too vast and sparse,found a few items of interest but I find the search generally as useful as a cock flavoured lollipop most of the time