This pressure monitor was an Ohmeda 2300 Finapres. It provided continuous measurement of finger arterial blood pressure, displaying the pressure waveform; digital values of systolic, diastolic and mean pressure; heart rate (pulse); and a time-annotated trend display. This monitor required only electrical power to operate. A small, quiet pump in the monitor unit provided the finger cuff with required air pressure. The Finapres did not contain a pressure transducer; instead it had a reference transducer. This transducer adjusts for variances in pressure in the event the hand is moved below heart level. The Finapres uses a finger cuff to measure systolic and diastolic arterial pressure waveform. A built-in alarm sounds whenever pressures exceed designated values.