It is necessary because measuring tools help you measure the length of an object accurately.
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A ruler.
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.
You need different tools these measurements. For mass you want a scale or balance. You can only use the same tool for length and volume (a ruler, caliper or similar) if the object you are measuring is a well defined solid with known geometric shape. Otherwise you will have to perform a measuring experiment for example put the object you want to determine the volume of in a graduated cylinder, pour a known volume of liquid into the cylinder, read the volume and subtract to determine the object's volume.
The answer will depend on the object that you wish to measure. For example, a balance and some standard masses (wrongly called weights) will be OK for measuring the mass of a few apples but not much use for the mass of an elephant and totally useless for the mass of the sun! In the latter case, the tools are spectroscopy and computers, with physics and mathematics as intellectual tools.
ruler, meter stick, yard stick.