cruz..................i've been playing with these toys for over 30 years...........i am a veteran of hardcore Free Flight gas competition where accuracy is second to none. of course throw meters are not used in setting up FF models, but for setting up and RC model, i find the Accu throw meters to be a great asset.............using a ruler works, but why not enjoy the easy to use meters?..........they make life easy, and assist you much better than using a ruler.................go for it