Purchased on the first lockdown for 40 euros. Good construction and long battery life. It takes 2 AAA batteries which you can easily find everywhere and at a good price. The only drawback is that in order to be sure of the measurements, you have to take a measurement from both the index and middle finger. Other than that, it is very good and does its job well.

Easy to use, simple, and reliable in its measurements. I bought it for my father who had COVID and needed to monitor his oxygen levels. It gave the same readings as the hospital oximeter when we had to take him there. Just something that applies to all beginners, when it was first used, we took measurements from the finger and both hands. Generally, we take 2-3 measurements because the first one may show a very low value.