Inclusion Criteria:  Health volunteers 18 years and above; equal numbers of males and females to address Sex As a Biological Variable (SABV); and in sinus rhythm. Agree to commit to participate in the current protocol. Provide written informed consent prior to any study procedures being performed (all subjects should be able to understand the informed consent form and any other documents that subjects are required to read).  Exclusion Criteria:  Unable or unwilling to provide informed consent Any other condition that would increase the risk of participation in the study in the opinion of the site Investigator. A difference of >10 mm Hg in left versus right arm oscillometric systolic BP. Upper extremity arteriovenous hemodialysis shunt. Wrist distortion or pain from arthritis. Prior trauma or surgery at the radial artery monitoring site.