DSA25 Series: The entry level instrument which is an easy-to-use and reliable for measuring contact angle, Surface Free energy and Surface & Interfacial Tension measurement by Pendent drop method. The trend to water-based bonding, coating and printing on plastics has made solving wetting problems an important challange, With the DSA25, KRUSS covers the increasing demand for rapid wetting tests.   DSA25 Series configuration DSA25 B: Basic configuration. DSA25 S: Standard configuration. DSA25 E: Expert configuration.