KingTop Technology Co., Ltd. is a leading manufacturer, supplier, and factory of high-quality medical devices. One of our most popular products is the pulse oximeter, which helps measure the oxygen levels in your blood. This non-invasive medical device is easy to use and provides quick and accurate results. When using a pulse oximeter, the question arises, which finger should you use for the measure? The answer is that any finger can be used, but the index or middle finger works best. It is essential to ensure that the device is placed correctly on the finger and that the finger is free from nail polish or acrylic nails, which can interfere with the readings. At KingTop Technology Co., Ltd., we offer pulse oximeters that are reliable, accurate, and user-friendly. Our devices are FDA approved and CE certified, ensuring that they meet the highest international standards. So, whether you're a healthcare professional or a home user, you can trust our pulse oximeters to provide you with the information you need to monitor your oxygen levels accurately. Contact us today to learn more about our products and services.