How about a micrometer
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A ruler that can measure very small units.
For surveying, there are some use of tools. Look at them, The Dividing Engine, Chains, Calculating device (non electric), leveling machine , strange and some other. These tools are very unique to use.
Ah, the length to mass ratio, also known as the aspect ratio, is a simple concept. It's just the ratio of an object's length to its mass. So, if you have a long, skinny object that weighs very little, you'll have a high length to mass ratio. And if you have a short, heavy object, you'll have a low length to mass ratio. Easy peasy lemon squeezy.
You measure it very, very carefully!
a "n-m per second" is a measure of speed, not of distance. At that speed something can be very, very near if measured for a very short time or it could be millions of light years away if measured for a sufficiently long time. The question, therefore, makes no sense.