Anyone using the Oura ring to track their cardiovascular age?

Joseph I need an accurate device to tell me my O2 saturation during the night - sounds like the Oura does that? Does it give an average or by hour or can you set it to record if dips to a certain level? I’m not at all familiar with these devices. There is a Wellue brand that does only sleep and will vibrate when gets to certain set level but the reviews are mixed. Thanks.