In the future, if you'd like even more precise measurements, theoretically you could use 2 different frequencies or a reflected source, and look at the interference or superposition of the waves.

I'm by no means an expert in this, but I've heard that optical measurement (eg: laser + Michelson interferometer) could theoretically take you down to the nanometer range.

But it's easy to go overboard with this, haha.

https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-20-5-56...

https://iopscience.iop.org/article/10.1088/0957-0233/9/7/004