Aluminium Fetal Stethoscope is traditionally used Fetalscope. The aluminium is ionised and provides excellent acoustic to hear the heart beat of the fetus. The sound heard is direct from the fetus ie it is not ultrasound doppler converted sound. It is more economical as compared to other alternatives. Also it saves the mother and the baby from any disadvantages of ultrasound.
Pinard stethoscope (aluminium anodized) remain a popular choice for midwives to listen to foetal heart sounds. Available in Plastic, Aluminium.