Sonotrax is a doppler that is available in two models.
Sonotrax A has no display, while Sonotrax B can show heart rate and type of probe.
Sonotrax B offers 3 heart rate processing modes: real-time foetal heart rate, average foetal heart rate and manual mode.
Both modules offer audio feedback and can be attached to ear plugs or a recorder with audio input.
Both devices can be linked to a 2MHz (foetal) or 8MHz (vascular) probe.