This little thing seems great! I got it because I woke up terrified one night while I had COVID forcing myself to breathe deep breaths since it felt like I was suffocating and couldn't get enough air. While I do not know what my O2 was at that time, it made me purchase this the next day in case I had another situation like that arise.I used it frequently for a week or two afterwards just to be sure. It is very easy to use and read, and it seems to be fairly accurate for me. It also seems solidly made and I really can't find anything to complain about. It just works, and it works well. One of those times that it felt like you get what you pay for, though I did not purchase a cheaper model to be able to compare it to, Even still, I recommend this.
Rating: [5 of 5 Stars!]