Measuring scale should be made up the metal whose linear expansivity is negligibly small. Why?

Because the lever would change with small changes.

Explanation:

When a material that has a rather high thermal expansion coefficients is used, the length of the level arm length changes with corresponding changes in its temperature. This, isn't a good phenomenon, and so as not to interfere, that's why there is a need for materials with lower thermal expansion coefficient.

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia