Whatever disc and light you use, you should think about finding a record in your collection that has a dynamic track and play that while setting the speed. This will account for stylus drag.
how to set speed with strobe and speed controller
I have a Nottingham Dais which uses an outboard speed controller to set the speed. I have a small light and a paper disc used to set the speed. I've never done this and there are no instructions, which is typical of Nottingham products.