A Comprehensive Optical Blood Pressure Assessment Tool to Identify Cases of Unscreened Hypertension Across an Active Population in the U.S.

Inclusion Criteria: 1. Adult subjects aged 25 to 70 years old. 2. People who self-report that they do not have a diagnosis of hypertension. 3. People employed as a Nucor team member. 4. People who can read and speak English. 5. People who use either an iOS or Android smart phone. 6. Subjects who agree to follow study procedures. 7. Subjects who have signed the informed consent form. Exclusion Criteria: 1. Subjects with a known diagnosis of i. atrial fibrillation ii. congestive heart failure iii. heart valve disease iv. pheochromocytoma v. Raynaud's disease vi. arm lymphedema. 2. Subjects who take insulin. 3. Subjects who are on hemodialysis. 4. Women who are known to be pregnant. 5. Subjects whose arms shake uncontrollably or are paralyzed (cannot move). 6. Subjects who do not have two arms. 7. Subjects with upper arm circumference \< 22cm or \> 42cm. 8. Subjects with wrist circumference \> 23cm.