Parks Bi-Directional Dual Frequency Doppler with meters and recorder output. 

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.

Probes in the 8–9 MHz range are suited for vessels close to the skin, such as many ankle, foot, and upper‑extremity arteries. 4 MHz probes, with a larger tip, are intended for deeper arteries and veins.

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.

Directional probes provide separate audio channels for forward and reverse flow, assisting in arterial and venous flow characterization when used with standard vascular lab protocols.

Item comes with two pencil probes: one high frequency pencil probe (8.0-9.9 Mhz)

and one low frequency pencil probe (3.9-4.2 Mhz).

Select high and low frequency designations below. 

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.