Horiba Calibrator Carbon Dioxide (CO2) 3 X 3 mL (721505_EA) 1/EAThis ABX Pentra CO2 calibrator plays a critical role in ensuring the accuracy and reliability of CO2 measurements obtained from blood gas analyzers, which are essential for diagnosing and monitoring respiratory and metabolic disorders in clinical settings. There are three 3 mL vials of ready to use calibrator in a box.