RI21

The RI21 is our high-precision standard measuring probe for surface and interfacial tension using the Du Noüy ring method. The wire ring made of a platinum-iridium precious metal alloy is ideally wettable; the hardness of the iridium makes the measuring probe especially robust. The ring geometry is only connected to the shaft at two junctures, so that any disturbing influences on the wetting are negligible. A high-quality protective box is provided for its safe storage.

An RIC21 version of the ring with a certificate from an independent testing institute is also available.