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Feature: 620VP TFT LCD displays the wave of the instant blood flow average velocity and strength. It  prints the monitoring blood flow curve simultaneously; Detect the blood stream status of arterial/venous by 8MHz probe; Detect the blood flow average velocity, detect the result of fingers/toes and part of body’s vein anatomies operation; BV-620VP(TFT) portable bidirectional vascular Doppler with large color LCD screen; Built-in ARM microprocessor & real-time displays blood flow velocity waveform; Can store 50 detected waveforms; High-speed USB/RS -232 port, can be connected directly to computer to analyze, store, and print the waveform data; Detect peak and average blood speed Detect blood flow of peripheral vessel Detect subsection systolic pressure Detect phlebostenosis, vein occlusions Detect Systolic pressure of toes and fingers Detect blood speed during recovery Detect the pulse rate and show PR simultaneously Specification: Frequency range:Main unit：200±80~5000±1000HZ Probe：350±80~2500±500HZ External output：loudspeaker, single channel with earphone jack Emissive waveform: sine wave Ultrasonic frequency：5.0MHz±10% 、8.0MHz ±10% Ultrasonic frequency average intensity：  100dB Printing speed：40cm/min,60cm/min ,display synchronize with print Frequency mode display range：0.2 KHz～7.0 KHz LCD Display：128 X 64 dots, LCD cursor indicates blood stream speed, double display mode for the spectrum and velocity. Power indication: blue LED indication Charge indication: the charge indicator is yellow when charging and become green after full charge Alarm indication: the indicator light is red when the lack of battery Lack of paper indication: When the recorder is lack of paper, the indication light is red Outline dimension：210*220*105 (mm) Net weight：1.9 Kg Environment condition: Temperature：+5℃ ~ +40℃ , Humidity：<80％, Atmospheric pressure：86kPa ~ 106kPa. Transport and storage environment： Temperature：-10℃ ~ +55℃ , Humidity：<80％, Atmospheric pressure：86kPa ~ 106kPa