Belun SpO2 Accuracy Comparison to Arterial Blood CO-Oximetry

Inclusion Criteria: * 10-15 Adults with a minimum of 3 males and a minimum of 3 females, with the balance made up of either * Subject must have the ability to understand and provide written informed consent * Subject is 18 to 50 years of age * Subject must be willing and able to comply with study procedures and duration * Subject is a non-smoker or who has not smoked within 2 days prior to the study Exclusion Criteria: * Subject is considered as being morbidly obese (defined as BMI \>39.5) * Compromised circulation, injury, or physical malformation of fingers, wrist, hands, ears or forehead/skull or other sensor sites which would limit the ability to test sites needed for the study. (Note: Certain malformations may still allow subjects to participate if the condition is noted and would not affect the particular sites utilized.) * Female subjects that are actively trying to get pregnant or are pregnant (confirmed by positive urine pregnancy test unless the subject is known to be not of child-bearing potential). * Smoker Subjects who have refrained will be screened for COHb levels \>3% as assessed with a Masimo Radical 7 (Rainbow) * Subjects with known respiratory conditions such as: (self-reported) * uncontrolled / severe asthma, * flu, * pneumonia / bronchitis, * shortness of breath / respiratory distress, * unresolved respiratory or lung surgery with continued indications of health issues, * emphysema, COPD, lung disease * Subjects with known heart or cardiovascular conditions such as: (self-reported, except for blood pressure and ECG review) * hypertension: systolic \>140mmHg, Diastolic \>90mmHg on 3 consecutive readings (reviewed during health screen). * have had cardiovascular surgery * Chest pain (angina) * heart rhythms other than a normal sinus rhythm or with respiratory sinus arrhythmia (reviewed during health screen) * previous heart attack * blocked artery * unexplained shortness of breath * congestive heart failure (CHF) * history of stroke * transient ischemic attack * carotid artery disease * myocardial ischemia * myocardial infarction * cardiomyopathy * Self-reported health conditions as identified in the Health Assessment Form (self-reported) * diabetes, * uncontrolled thyroid disease, * kidney disease / chronic renal impairment, * history of seizures (except childhood febrile seizures), * epilepsy, * history of unexplained syncope, * recent history of frequent migraine headaches, * recent symptomatic head injury (within the last 2 months) * cancer / chemotherapy * Subjects with known clotting disorders (self-reported) * history of bleeding disorders or personal history of prolonged bleeding from injury * history of blood clots * hemophilia * current use of blood thinner: prescription or daily use of aspirin * Subjects with severe contact allergies to standard adhesives, latex or other materials found in pulse oximetry sensors, ECG electrodes, respiration monitor electrodes or other medical sensors (self-reported) * Subjects with severe allergies to iodine (only applicable if iodine is used) * Subjects with severe allergies to lidocaine (or similar pharmacological agents, e.g. Novocain) * Failure of the Perfusion Index Ulnar/Ulnar+Radial Ratio test (Ratio \< 0.4) * Unwillingness or inability to remove colored nail polish from test digits. * Other known health condition, should be considered upon disclosure in health assessment form