Although Apple Watch Series 4 came out two years ago and even stopped production, users from Russia did not get access to the ECG function. Of course, not only us were cheated. For the first three months, she did not even work in the United States, let alone any other country in the world. However, Apple managed to systematically launch the ECG measurement function plus or minus everywhere except Russia, where this function still does not work. How will it be with blood oxygen measurement? Let’s figure it out.