An antique medical uterine sound, estimated to date from around 1880. The probe tip splits into two hemispherical strips running the full length, one on each side, one of these has become partially detached, there are no breaks in the strips. The top of the sound bears an inscription of the number 1 in a stylised script.

'Uterine sounds or sonde are intended for probing a woman's uterus through the cervix to measure the length and direction of the cervical canal and uterus.

Uterine sounding may be performed prior to embryo transfer to determine the uterine depth and how easily an embryo transfer catheter can be passed through the cervix. In this case, it may also be called a trial transfer. It is performed prior to insertion of an intrauterine device (IUD) in order to measure the length and direction of the cervical canal and uterus. This reduces the risk of perforating the uterus with the IUD. This may occur when the IUD is inserted too deeply or at the wrong angle.' Wikipedia.

This example measures 35cm (13.75") in length.

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