Evaluation of HR Readings from later subjects (at least 10) will be used to evaluate the accuracy and validity of HR measurements from the novel oximeter. Paired HR readings from the test oximeter and the reference oximeters are grouped into four ranges (40-65, 66-90, 91-115, and 116-140 beats per minute (bpm)). Mean bias, precision and accuracy are calculated as per ISO definitions for each group of HR ranges and the overall range (40-140 bpm), as detailed previously for SpO2.