Arterial & Venous measurement The AngE Phlebo OPO is a 2-channel D-PPG/LRR & OPO device. Its two light sensors allows a venous function measurements for easy diagnosis hemodynamically significant venous valve damage and an assessment of muscle pump function. The instrument must be connected to the startup of a computer. With the included software you can easily create a patient database, record measurements and assign them to a physician. The AngE software not only stores the necessary values, but records the entire measurement every time. Thus helping doctors get the best result.