Read our guide to the best digital thermometers - we also explain the different types to help you choose Perfusion index Usually only pricier pulse oximeters will have this feature. It measures the ratio of pulsating to non-pulsating blood in your finger, and is used as an indication of how strong your blood flow is. Most people are unlikely to need this on a regular basis, and we don't test it in our lab. During the pandemic, some doctors have suggested buying pulse oximeters to test your oxygen levels at home as a precaution, in case you become severely unwell with Covid-19. Trials are ongoing, but if you're unwell, it's important not to rely on these devices without advice from a medical professional.

Make sure you wash your hands thoroughly before using the pulse oximeter. The finger you are going to use shouldn't have any nail varnish or a false nail on it, as these make it hard to obtain an accurate reading. We implemented a Great Value badge that highlights good products that are at least 20% cheaper than the average product we've tested in pulse oximeters. Find out more about how our Great Value recommendations will help you save money. If you're concerned about your respiratory health and think a pulse oximeter would be beneficial, speak to a medical professional first. Pulse oximeters are not a substitute for medical advice, and any at-home monitoring should be part of a clear health management plan. Ensure your hand is warm to the touch, then sit down and let it rest on your chest for about five minutes before switching on the pulse oximeter.Make sure you thoroughly read the instructions that come with your pulse oximeter, but as a general guide, these tips can help to get accurate readings: Find out more about the debate over pulse oximeters and Covid-19 . How much do pulse oximeters cost? Pulse rate The number of times your heart beats per minute. For a healthy adult, this is usually around 60-100bpm. On most pulse oximeters this is displayed as a number, but it can also be in the form of a bar graph or plethysmographic waveform (a continuous curve showing your heart rate). To prove that oxblood shoes deserve a spot in your rotation, we’ve found the most wearable types of shoes you can find in the shade. You deserve at least one of them. Loafers

SpO2 reading A measurement of how much oxygen is in your blood. Every pulse oximeter has this feature, as it's the main thing they're designed to measure. A SpO2 reading of less than 92% (or 88% for those with chronic obstructive pulmonary disease) can suggest someone is seriously ill and needs immediate medical attention. Pulse oximeters are useful monitoring devices to have at home for certain groups of people, such as those who are prone to respiratory failure, suffer from a chronic respiratory condition or require oxygen therapy. For these patients, a drop in oxygen levels could point to something much more serious.A pair of Redwing boots in burgundy looks slightly dressier than the same style in brown, and a factory floor is no place for a pair of rich, oxblood work boots. Not that you’d do manual labour in any of these. Save them for date night outfits and smart-casual offices.