SIMS Vaginal Speculum, No. 1, with dimensions 70x25mm/75x30mm, is a confirmed and standard instrument. This specific model is a double-ended speculum, its precise blade dimensions are 70 x 25 mm on one end and 75 x 30 mm on the other.

The double-ended design gives each end a slightly different curve to allow for varied retraction of the vaginal walls. As a non-self-retaining instrument, an assistant must hold it, but this allows for 360-degree rotation and better visualization of the vaginal walls and cervix for a range of procedures. It is smaller than other specula like the Doyen or Auvard and is indicated for children, young adolescents, and women with a narrow vaginal anatomy.