Mericonn portable oxygen level reader Manufacturer TFT display Fingertip Pulse Oximeter function: new design 8 second fast measurement 5 second automatic shutdown without detection low power prompt pulse rate display About fingertip oximeter The blood oximeter uses non-invasive infrared measurement technology to measure the oxygen content in fingers, toes and ears, which is the most common place to measure blood oxygen. The more accurate name of the measurement object is blood oxygen saturation, namely SpO2. The measured results are expressed in digital form. The main display is the ratio of total oxygen saturation under the actual oxygen content, which is generally expressed in percentage. The typical blood oxygen saturation of human health is 90~100%, But at least 60% can be passed.