This high precision variant of the Du Noüy method was developed by Padday et al. (J Chem Soc Far Trans I 71: 1919-1931, 1974). The technique is very simple: a thin rod (instead of a ring or a plate) is immersed into the sample and then pulled out and the maximum force is measured. The diameter of the probe is irrelevant and only if the diameter changes there is a need to recalibrate. This is automated and fast in all Kibron instruments. When calibration is done using a liquid with a known surface tension there is no need for correction. The weight of the meniscus depends only on surface tension, rod diameter, and the density of the liquid (see the above article by Padday et al.).