Not only is this product ideal for testing oxygen levels in percentage form, it is also great for monitoring the heart rate too. The trouble with many other heart rate monitors is that they are really cumbersome. Some blood pressure monitors test the heart rate, but too are really bulky. This device just sits on a finger and takes the heart rate and oxygen saturation levels in about three seconds.
My only criticism is that the print in the instruction book is quite small. This however does not deter from the fact that this is a top product at a good price.