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There are two main types: fingertip clamp-on to get a single reading (like used in the doctor’s office) and recording where you can wear the device overnight. For recording, there are a couple of good miniaturized ones that fit on your index finger or thumb. There are others where you wear a wrist watch size gadget on your wrist that connects by a wire to a finger tip measuring instrument.

I went with the ring concept recorder. I bought the “O2 Ring” on Amazon.
https://getwellue.com/pages/o2ring-oxygen-monitor

I’ve read good reviews of the “Oura” ring, too.
https://ouraring.com/

The “O2 Ring” is a soft gray rubber that our dog thinks is a chew toy for him if I accidentally drop it on the ground. That destroyed it.

Being so small and compact, it’s rechargeable battery lasts two nights so you have to charge it every day. Also, the memory holds three nights of data, so you need to download the data at least every third day. If you don’t, the ring overwrites the oldest days data. That way you always have the most recent three days data. The company makes a good mobile app and a pretty good computer app, too. They sell cloud storage for the data, but I download to my phone and computer. These are two separate, unrelated download actions.both are easy to do and fast. It’s a Chinese company, so I did not buy their cloud storage.

Are these a panacea? No. Do they fix sleep problems? No. But they DO give a very good indication of how severe your problem is and whether steps you are taking are improving your sleep.

Just be prepared to charge the ring daily and download the data every three days if you want to preserve all your data. So a tiny bit of work is required. For me, daily is less than a minute to charge it and download data to the mobile app. Every third day I’d 5-10 minutes to download the data to my computer. I use their app on my Mac to also save csv files and pdf files whenever I download the data.