Sensing Device on a Surface (image) Physikalisch-Technische Bundesanstalt (PTB) Caption This is a simplified representation of a probe which delineates the surface of a component. To be able to precisely measure also the height of small components made of polymers, the manufacturers need a new procedure. Credit Photo: PTB Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.