The Sims Uterine Sound, Rigid, 33cm (13") is used to determine the length and direction of the cervical canal and uterine cavity. It is a manual, probe-style instrument with a specific function in gynecology and obstetrics.

The blunt, bulbous tip is a key safety feature designed to minimize the risk of uterine perforation during sounding. The rigid shaft provides a fixed profile and is an alternative to the malleable variant, which can be bent to accommodate anatomical variations.