Participants with suspected hypertension will be recruited from a population of patients seen at three primary health centers in an urban area. According to the sample size estimation, a minimum sample size of 214 participants would be needed for the study. Four diagnostic tests will be performed: OBPM at three visits, HBPM, AMPM and 1BPM. The test order for the 24-hour monitoring, and 1-hour monitoring, will be set randomly. Daytime records of ABPM will be compared to all other monitoring methods using the correlation coefficients and Bland Altman plots. The Kappa index will be used to calculate degree of agreement. The sensitivity and specificity of the methods will also be calculated.