Dual cuff pressure monitor for the assessment of ankle brachial pressure index (ABPI) and the detection of atrial fibrillation (AF). During a rest period of at least 5 minutes, the blood pressure is measured in both arms simultaneously to determine which has the highest and to screen for AF. Next, the arm with the highest blood pressure and both legs are measured simultaneously. WatchBP software then facilitates an automated ABPI assessment within 4 minutes. Validated by the NHS Technology Adoption Centre. System comprises cuffs, mini USB port, rechargeable battery pack and an automated office blood pressure measurement device.