What is stopping people from making meter sticks with 3000 lines, i.e. every third of a millimeter is marked? (The point is, there is nothing any more "infinit

What is stopping people from making meter sticks with 3000 lines, i.e. every third of a millimeter is marked? (The point is, there is nothing any more "infinite" about the rational number 1/3 than 1/4, 1/5, 1/2 or what have you. It just can't be written in the arbitrary base 10 system, just like 1/5 can't be written in base 12)