The Rad-57 is a handheld Pulse CO-Oximeter powered by Masimo SET pulse oximetry and upgradeable rainbow Pulse CO-Oximetry. It enables quick, continuous, noninvasive measurement of carboxyhemoglobin (SpCO) and methemoglobin (SpMet), alongside total hemoglobin (SpHb), oxygen content (SpOC), standard SpO2, pulse rate, perfusion index, and Pleth Variability Index (PVi). Integrated Signal I.Q. technology alerts clinicians to periods of low measurement confidence. The device features up to 72 hours of trending memory. Designed for rugged use, it is ideal for EMS and field applications, with reinforced patient cables and compatible with specialized sensors like the LNCS-II rainbow DCI 8λ SpCO Adult Sensor.