Evaluation of SpO2 Readings from later subjects (at least 10) will be used to evaluate the accuracy and validity of the SpO2 measurements from both novel oximeters. Paired readings from the test oximeters and the reference oximeter are grouped into six ranges (70-75%, 76-80%, 81-85%, 86-90%, 91-95% and 96-100%). Mean bias, precision and accuracy will be calculated as per ISO definitions for each group of SpO2 ranges and the overall range (70-100%) [5].