Too funny, I thought your two rods was great. The big question is why I have never thought of that at some point in time. I have used rulers to measure the distance from the ground to the elevators, used steel straight edges across the bottom of the stab across the bottom of the elevators but never once came up with those two rods!! My advanced instructor had been making up those meters for years before someone decided to make and sell them. He made up a bunch in his spare time and sold them at different fields. You can make your own or pay the $25.00 for one. Mine are high end though, I use real photo paper when I copy the degree face.