Krüss has developed an innovative spinning drop tensiometer, the "SDT". This measures interfacial and surface tension with a high degree of accuracy and a measuring range of 10-6 to 80 mN/m. In addition to the standard Vonnegut method, its "Advance" software evaluates the drop shape in accordance with Young-Laplace. This reduces the rotational speed needed for high interfacial and surface tensions, so the instrument can measure not only low interfacial tensions but also the surface tension of aqueous solutions. All components are enclosed in a sturdy closed housing, which virtually eliminates the risk of injury. The procedure for changing samples ...