Blood pressure measurement methods and conditions are determinants of hypertension diagnosis. The classical methods such as office blood pressure measurement (OBPM) and home blood pressure monitoring (HBPM) have significant limitations. A recent British guideline recommends systematic 24-hour ambulatory blood pressure monitoring (ABPM). However, these devices are not available at all health centers and they can only be used by one patient per day. The aim this study is to validate a new method, 1-hour blood pressure monitoring (1BPM), to diagnose the hypertension.