I had to check the float hight on my 1978 CB750K8, not a big deal. But I needed a smaller ruler so i went to wal-fart and nothing,but Radio shack ...
Radio Shack has a little depth gauge by Kronus. It costs $1.99 and has a lifetime warranty. It's marked in 1/64 and 1mm increments. It is a whole lot easier to use it than a ruler cause u just set the little slide and badda bing, your done.
anyway
Don