If you are looking for an answer to the question of what is a pulse oximeter device, this article is for you. Pulse oximeters are devices that can quickly and easily measure and record your heart rate per minute and your blood oxygen level. It was first used in hospitals. It is among the most needed medical devices in intensive care and anesthesia units. There are pulse oximeter devices that measure directly from the finger and can measure from the forehead or ear. It measures the oxygen in the blood by making use of the light passing through the tissue. With this feature, it makes detection faster and easier without taking blood from the patient. There are models produced in sizes that are small enough to fit in a pocket. In addition to devices that can only measure, there are also devices that can record measurement data. Although these records vary from device to device, they can be viewed externally on their own screen or by transferring them to a computer. Pulse oximeters, which can be connected to the internet, send the data directly to the server and provide cloud-based inspection. It is more difficult to delete or lose data, as it is possible to examine cloud-based data from anywhere. It is among the most necessary devices in the home care process for patients. What does the oximeter do? After examining this question briefly, let us inform you about its varieties.