SP300 Finger Pulse Oximeter is a small, lightweight and portable device suitable for use with either adults or childrenThis Pulse Oximeter is an ideal diagnostic tool for ambulance paramedics and emergency medical technicians working at the roadside.* SpO2%, PR and Pleth waveforms are displayed on screen* The display can be easily rotated to display in 4 directions* Simple and convenient operation OLED display* Extremely compact weighing only 50g including batteries* Low power consumption, two AAA batteries can be continuously operated for 20 hours* Adjustable background brightness* Range: 30-235 BPM* Accuracy: +/- 2 BP