The NONIN SenSmart Model X-100 is a universal oximetry system featuring rO2 sensors which provide clinicians with state-of-the-art absolute accuracy that reduces the need to establish a patient baseline and provides values they can act on with confidence. It provides a side-by-side view of rSO2 and SpO2, providing clinicians with the opportunity to explore what a gradient between rSO2 and SpO2 might reveal.