Additional Study Information: The measurement of blood pressure is used to determine if a person has high blood pressure (also known as hypertension) and whether their blood pressure is controlled while taking medications that lower blood pressure. For many people, blood pressure levels are different when measured in a provider's office versus during normal daily activities outside of the office. There are two ways to measure blood pressure outside of the office: ambulatory blood pressure monitoring (ABPM) and home blood pressure monitoring (HBPM). The best approach to measure blood pressure outside of the office is unclear. The purpose of this research is to compare office blood pressure measurement, ABPM, and HBPM. Eligible participants include English or Spanish-speaking adults (18 years or older) who do not have any of the following: History of a major arrhythmias (an abnormal rhythm of the heart), are pregnant or plan to become pregnant during the study, unable to have blood pressure measured in at least one arm, work as a truck driver, work overnight shifts, or take medications to lower blood pressure and your provider changed the dose or type of medication in the prior 2 weeks, or there will be a change in the medications in the near future. Study participation will include having blood pressure measured inside and outside of the office, and keeping 3 visits. The duration of the study is at least 24 days. Up to $240 compensation is available to those who meet all eligibility requirements and who complete all study requirements.