SOPAT Ltd. 1 article published in JoVE Engineering A Cost-effective and Reliable Method to Predict Mechanical Stress in Single-use and Standard Pumps Ina Dittler1, Wolfgang Dornfeld2, Reto Schöb2, Jared Cocke3, Jürgen Rojahn3, Matthias Kraume4, Dieter Eibl1 1Institute of Biotechnology, School of Life Sciences and Facility Management, Zurich University of Applied Sciences, 2Levitronix Ltd., 3SOPAT Ltd., 4Institute of Chemical and Process Engineering, Technische Universität Berlin Shear stress investigations on an oil-water emulsion system result in drop breakup over the experimental time. To count drop sizes in pumping processes, the suitability of inline endoscopy was successfully demonstrated in this protocol.