If you look at some advertisements from Chief or any of the bigger hobby shops you can buy these meters. I also make up the ones that use a clamp on the elevators with a weighted pendulum on the needle. When I set up a plane I measure all my control throws in degrees. Sport planes at about 10 degrees and 3-D planes I set up at about 18 degrees for low rates and 25 degrees for high rates. After test flying the planes I decide if the rates require more or less throw and then adjust accordingly. I always set the rudder with as much throw as I can get. I have a bunch of these in my shop, I make them using scrap wood so the price for one is zero.