Ramister - straight hysterometer
Used to measure uterus depth.
It is straight, slightly conical (from 3 to 5 mm o.d.) and centimeter marked.
Rounded tip allows a comfortable insertion through the cervical canal and malleable plastics permits manual bending of the instrument where necessary.
Measurement scale ranges from 4 to 15 cm (1 cm resolution) and allows a direct reading on the probe.