Yes, a very accurate one too. Much better than anything I’ve see you can buy. You'll never go back to a ruler. It is simply degrees drawn out on a board for a gauge, the board mounts to an adjustable stand, and a pointer is taped to the control surface. I used autocad to make the degree scale on the gauge, but you could take a protractor and copy/enlarge it to whatever size you want if you don’t have cad or similar. The key thing to record is the radius of the arc. Make a pointer stick that length. I use carbon rod with a pin glued to the end. Make a stand however you want. I used a dowel in a base and then have an adjustable fitting with a thumbscrew to attach and rotate the gauge. To use, tape the pointer stick to the control surface as close to the hinge line as you can. Move in your stand and gauge and adjust it so it reads zero and the gauge is perpendicular to the pointer (importnat!) Presto. A degree scale that is very accurate. Mine uses a 16.5” radius and I can easily resolve to 1/5 of a degree. You’d be surprised how much better planes fly when the control surfaces really are matched. Hope the pics are understandable, I have a project on my building table and couldn’t really set up the gauge properly, but I think you get the general idea. If not, post questions and I’ll try to respond.