This instrument, when inserted into the vagina, measures the degree of blood engorgement by registering the color of the vaginal walls through a photoelectric cell.

• 可以同时通过光电池发光显示阴道壁的颜色所代表的阴道壁的充血程度和肌肉生物电冲动所代表的肌张力，测量性兴奋度。