A pendent drop apparatus for rapidly measuring very low interfacial tensions is described. Interfacial tensions as low as 0.001 d/cm have been measured at 25°C in a water‐oil system. These measurements were made possible through the combined use of small drop‐forming tips, long working distance objectives, electronic flash illumination and Polaroid Land film. Examples of measurements on water‐oil systems are given. The apparatus is designed to provide interfacial tension data as a function of temperature. In addition, the method permits the measurement of interfacial tension as a function of the age of the interface.