The Blood Monitoring Unit BMU 40 helps during extracorporeal circulation in continuous monitoring and measurement of vital blood parameters. The device with its unique barcode calibration system can measure the values of oxygen partial pressure (paO2) and temperature (Ta) on the arterial side and oxygen saturation (SvO2), hemoglobin (Hb), hematocrit (HCT), and temperature (Tv) on the venous side as well. The high space 10.4" touch screen monitor displays the values enabling a complete customization of the control elements and important displays. The BMU 40 from MAQUET with its unque system of encodes helps to save time of calibration and minimize the measuring tolerances during the operation of heart lung machine.