photostethoscope

pho·to·steth·o·scope

(fō'tō-steth'ŏ-skōp),
Device that converts sound into flashes of light; used for continuous observation of the fetal heart.

pho·to·steth·o·scope

(fō'tō-steth'ŏ-skōp)
Device that converts sound into flashes of light; used for continuous observation of the fetal heart.