Fingertip Pulse Oximeter Clinical Test

Inclusion Criteria: * Subjects participate in the study on a voluntary basis * All subjects should be in good health at the time of the study. Unless specified otherwise in the protocol, the following values could be applied: COHb\<3 %, MetHb\<2 %, ctHb\>10 g/dl; * Inclusion criteria should serve the purpose of the study Exclusion Criteria: * Smokers or individuals exposed to high levels of carbon monoxide that result in elevated carboxyhaemoglobin levels, unless specific dyshaemoglobins are called for in the study protocol. * Individuals subject to conditions that result in elevated levels of methaemoglobin, unless specific dyshaemoglobins are called for in the study protocol. * Subjects who would be placed at undue medical risk associated with any procedures called for in the protocol (e.g. arterial cannulation or hypoxia). * Age: young person and that of more than 50 years old.