What does a pulse oximeter measure?
It clips onto a fingertip and estimates your blood-oxygen saturation (SpO2) plus your pulse, by shining light through the skin. For most healthy people a normal SpO2 is about 95–100%. Because it reads through the skin, it’s an estimate — best used to watch trends. See how a pulse oximeter works.Which features matter?
Look for a clear, readable display, fast and stable readings, and a comfortable spring fit for your finger. A plethysmograph bar or signal-strength indicator helps you judge whether a reading is trustworthy. Beyond that, most fingertip models do the same core job.Who actually needs one?
A pulse oximeter is most useful for people with lung or heart conditions like COPD or asthma, and for keeping an eye on a respiratory illness. Most healthy people don’t need to monitor oxygen routinely, since it rarely changes meaningfully day to day.Do I need a special one for a child?
A standard adult oximeter may not fit a small child’s finger, and a loose fit is a common cause of bad readings. For infants and young children, choose a pediatric-sized probe or a model rated for small fingers. See oxygen levels for children.What separates a good device from a poor one?
Better oximeters give steadier readings and hold up better at weak signals or lower saturation, while bargain units can be jumpier. For everyday trend-watching, a basic fingertip device is usually fine; if you manage a serious condition, pick a reliable one and follow your doctor’s targets. Our accuracy guide explains what affects readings.How SonoHealth fits
SonoHealth offers a fingertip Pulse Oximeter for simple home spot-checks of oxygen and pulse. Whatever you choose, warm your hands, sit still, watch the trend, and weigh the number against how you actually feel. See it at SonoHealth.com.Related: Understanding SpO2 and Pulse Oximetry · Normal Oxygen Levels · Accuracy Guide · Oxygen Levels for Children