In this display case, we can see two weights made of stone (granite) and one made of iron. They have diverse geographic and temporal origins and would have been used to weigh different products, but given their shape and the materials they are made of, they illustrate the type of weights used in Portugal since time immemorial.

Two of the weights have iron handles and a more uniform shape, while the other does not have a handle and is of a shape that, upon first inspection, does not suggest that it is a measuring instrument.

The use of stone is to be expected, since it is a natural material, hence not requiring a great investment when it is used to make these instruments.