Lay a steel ruler against the face of the sprocket and sight along the chain. You can easily see which adjuster needs tweaking by the parallel or not parallel lines. Not as fancy as a dedicated tool and a laser is probably more accurate but I know you have this in your tool box.

A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)