Central aortic pressure is a better predictor for cardiovascular events than brachial pressure¹. There are a number of devices on the market that find a continuous measurement of pressure in the arm, and from it estimate the central aortic pressure². In this study we focus on one such device, the PulseCor 6.5 Monitor (PulseCor, Auckland, New Zealand) ³. We compare its output (central aortic pressure waveforms) with an ensemble average of the aortic pressure waveforms measured invasively using a pressure catheter (ComboWire XT GuideWire, Volcano Corporation, Belgium). The results show that the central aortic pressure waveforms have a qualitatively and quantitatively similar shape to the invasively measured waveforms (R=0.9505) (a typical result is shown in figure). The average differences in the systolic and diastolic readings of the device with the invasive measurements are 6.75 mmHg with range [−13.09, 32.0] and 18.15 mmHg with range [−8.45, 86.38], respectively (N=8). We conclude that although the non-invasively measured systolic and diastolic pressures do not match exactly to the invasive measured ones, the waveforms of both measurements are similar.