It all depends on the objects.
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It is necessary because measuring tools help you measure the length of an object accurately.
A meter rule.
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.
3 Height,Length,Width
It depends on the object that you are measuring. Some things are wider, and some are longer.