The Criterion 60 Pressure/Oxygen Monitor monitors patient airway pressure and oxygen concentration throughout the breathing cycle. The monitor uses solid-state pressure transducers to measure circuit and atmospheric pressures, and a galvanic oxygen sensor to measure the partial pressure of oxygen. The oxygen sensor samples gas directly without diverting it from the circuit. The monitor uses the atmospheric pressure and partial pressure of oxygen measurements to derive oxygen concentration.
 The Criterion 60 is intended for use with devices that are not capable of monitoring pressure or oxygen concentration (for example, a resuscitation bag or basic ventilator) or as an independent backup for devices that do measure pressure or oxygen.
 The Criterion 60 alarms when the airway pressure or oxygen concentration falls outside of the user-selected high and low alarm limits, and displays real-time airway pressure and oxygen concentration.
 The Criterion 60 also includes alarm delay (for pressure alarms), alarm silence, and alarm presilence features. Battery backup provides up to 24 hours of backup power in case of AC power failure or when AC power is not available.