Parks Dual Frequency Doppler with Pencil and obstetrical probe, Speaker and rechargeable battery, installed in a rugged carrying case. Parks Medical vascular Doppler probes are used for noninvasive assessment of blood flow in peripheral arteries and veins. Different probe frequencies help you evaluate both superficial and deeper vessels in a variety of vascular exams.

Dual‑frequency directional probes
Parks dual‑frequency directional probes combine two frequencies in one probe to support both superficial and deep vessel assessment. Typical combinations include 4 MHz with 8 or 9 MHz, allowing you to switch frequency on the same exam based on vessel depth and signal quality.

Choose one high frequency Pencil Probe
(8.0-9.9 Mhz - Best frequency range: Probes in the 8–9 MHz range are suited for vessels close to the skin, such as many ankle, foot, and upper‑extremity arteries.) 

and one Obstetrical Probe (2.10 to 2.25 Mhz.).

Compatibility
Each Parks probe is designed to operate at a specific frequency or pair of frequencies and must be used with a matching Parks Doppler instrument. Probe styles may be interchanged on compatible systems, but frequency matching is required to maintain performance.