The Nicolet Elite handheld Dopplers from Natus are available in four different versions - the 2 MHz or 3 MHz obstetric probes to hear the fetal heartbeat; and the flat 5 MHz or pencil tip 8 MHz vascular probes to screen patients at risk for stroke, peripheral arterial disease and other occlusive vascular conditions or to monitor difficult pulses and obtain systolic blood pressures quickly and easily.