To evaluate the association between the Perfusion index parameter and an independent measure of perfusion.

Perfusion index parameters measured with an Investigational Pulse Oximetry PCBA, paired with Market Released sensors, will be compared to perfusion levels measured by a FDA-cleared device equipped with a laser Doppler technology-based device for blood perfusion measurements. Continuous Perfusion index measurements will be taken during the test sequence.

Inclusion Criteria:

1. Subjects ≥18 years of age
2. Subject is able to participate for the duration of the study
3. Subject is willing to sign an informed consent
4. Subject weighs >40kg

Exclusion Criteria:

1. Previous injury or trauma to fingers or hands that may change blood flow or vascular supply and affect the ability to test sensors
2. Physiologic abnormalities that prevent proper application of pulse oximetry sensor
3. Severe contact allergies that cause a reaction to standard adhesive materials such as those found in medical sensors and electrodes.
4. Raynaud Syndrome
5. Repeated systolic blood pressure > 140mmHg -

Healthy Male or Female volunteers age ≥18 years, weighing greater than 40kgs.