Smoothness/ Roughness and porosity tester (Bendsen Type)

Description

Roughness of paper or similar material is defined as the volume of air that forced by a specified pressure
on a specimen and excerting a definate pressure on it.
A sample is placed on a perfect plane glass plate, measuring head on the test piece a controlled and smallair pressure pass through a flat metal ring and the specimen. The pressure difference read off on selected difference escapes in unit time by passing between the surface of the specimen and flat metal ring resting.

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