The success of coating and bonding, as well as other surface processes, depends on wettability. The relevant parameters are contact angle and surface free energy (SFE), which are measured with drops of one or more liquids that are dispensed onto the material. Automation of dosing devices has advanced to simplify serial testing of materials. However, the often-cumbersome change of liquids and slow positioning and dosing can lead to time losses. The Dosing Hub (photo) is a system for contact angle measurements that is designed for automatic dosing sequences with up to three different dosing units. With high-speed and precise positioning, the system enables reliable wetting analyses with up to four liquids. — Krüss GmbH, Hamburg, Germany