Pulse oximeters slip onto a finger and shine a bright light through it, measuring the absorption of the light in order to calculate the oxygen levels in the blood. Regular monitoring of blood oxygen levels can help to detect a number of problems early. This BBC article provides further information on why pulse oximeters have been recommended for use during the COVID-19 pandemic.
Pulse oximeters OLED display, SpO2, pulse rate, bar and waveform
Pulse oximeters with a cute bear design, specifically for use with children
Paediatric pulse oximeters with fun panda design to put children at ease
SpO2, pulse rate and bar, PI, plethysmograph and waveform