This depends on what you wish to measure. A Balance or a scale would be used for mass or weight. A ruler for length, or perhaps a vernier caliper. A clock for time. and so on.
Use trignometry
If you want to measure the length, use a ruler.
"sm" is not a standard measure of mass. Please use whole words and define what you mean.
Scientist would use milimeters.
A balanced scale, which compares the mass of one object with that of another.
You define the height of the object as one unit and then, to measure anything else, you count how many times larger than the unit it is.
Mass- a measure of how much space an object takes up
is to define the mass and the weight with measurement of the gravitational force on an object,...
When the object is larger than the ruler.
[object Object]
A scale.
Use trignometry
Use a ruler.
If you want to measure the length, use a ruler.
You would use Volume.
The Sun
No, a triple balance beam will measure the mass of an object but not its volume.