A ruler.
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It is necessary because measuring tools help you measure the length of an object accurately.
The operation in which we measure our desired vertical length and horizontal length with measuring tools (for example;scale,tri-square,vernier calliper, screw gauge,etc. ) and mark that measured vertical length and horizontal length by marking tools for example;scriber, etc. on our metal piece, is called measuring and marking operation.
ruler, meter stick, yard stick.
No. Measuring is getting an exact length. Estimating is guessing what the length is
Measuring tools are instruments used for obtaining quantities, dimensions or forces of real world objects.