"When the metallic side is pressed against the surface of an object, the rubber deforms slightly" while the concept is great, it still doesn't maximize precisi

"When the metallic side is pressed against the surface of an object, the rubber deforms slightly" while the concept is great, it still doesn't maximize precision (for high resolution analysis), since the pressure can also deform your object of interest. ideally, you would want to use a metallic as less viscous as possible to keep the surfaces rigid.