Parks Medical Electronics, Inc. is the world's oldest manufacturer of Doppler Ultrasound Systems. We were established in 1961 as Parks Electronics Laboratory, and manufactured impedance plethysmographs, mercury strain-gage plethysmographs, hearing testers, EKG telephone telemetry and exercise EKG telemetry in the years before Doppler. Parks made the first directional Doppler in 1965 and we have consistently had the top-performing directional Doppler with respect to sensitivity. We include more than twenty different Doppler devices in our product line. Our business is built on our reputation for designing and manufacturing instruments of exceptionally good performance and dependability, as well as our outstanding customer service. Ask the Bio-med techs in any hospital with Parks equipment about the reliability of our products.