Does a prototype have to be the exact size?

Does a prototype have to be the exact sizing or is it enough to show that the prototype functions properly? The problem that I have is with size; it will be hard to create the prototype because it's too small, so I was thinking of just resizing the prototype a bit bigger when in actuality the product will be a... show more Does a prototype have to be the exact sizing or is it enough to show that the prototype functions properly? The problem that I have is with size; it will be hard to create the prototype because it's too small, so I was thinking of just resizing the prototype a bit bigger when in actuality the product will be a smaller size.
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