NELLCOR N-20 HANDHELD PULSE OXIMETER WITH PROTECTIVE BOOT AND NEW ADULT PULSE OXIMETER FINGER SENSOR Convenient, effective handheld pulse oximeter. Manufacturer's info: Operates in either spot check or 30-minute extended mode for quick assessment of oxygen saturation and pulse rate. The Nellcor® N-20 has been shock-tested, vibration-tested and subjected to extreme temperatures.NELLCOR N-20 HANDHELD PULSE OXIMETER WITH PROTECTIVE BOOT AND NEW ADULT FINGER SENSOR BIOMED CERTIFIED.