A sincere Thank You to all the medical professionals giving their valuable time to add to this thread! I've been reading it nightly since day 1 but have held back from posting so I wouldnt add to the clutter.
Tonight I decided to post because the subject of Oximeters came up again and I wanted to share my personal experience.
Background:
About a month ago I went to the ER because I woke one morning with elevated pulse rate (upper 120s at rest), elevated blood pressure (145/85 when mine is generally 118/70), and chest pains, both pressure and shooting pains from middle of chest to left arm. A full day of multiple blood tests, several EKGs, a nuclear stress test, a 24hr heart monitor, and an echo have so far given no clues about what brought the symptoms on nor why they went away. My insurance company is now starting to fight my cardiologist on additional testing. I dont take no for an answer well and I'm a gadget geek so I decided the logical thing to do is start buying equipment to run my own tests to help the doc get the data he needs. I've ordered medical grade devices such as oximeter, EKG, Etc.
Couple of weeks ago, while waiting for my new gadgets, I read the first round of questions here about the finger clip Oximeters and it peaked my interest because of my recent orders. Someone mentioned the built in sensor in some Samsung phones. Since I have a Samsung that has a sensor, I decided to give it a go. My experience has been mixed. Several times it was reassuring because I felt bad but levels came back good (97-98%). A few times it scared the hell out of me because level came back low (68 - 70%) but I felt fine. One of my meters came in and I started testing them against one another. What I found was the phone was surprisingly right in line with the more expensive meter IF I held my finger in the right orientation and with the right pressure. If I altered either slightly, I would get a good sinus on the display indicating a solid read but measurements could differ by as much as 6-7%.
So from my layman's experience I would say the sensor on the Samsung is decent and is certainly better than nothing but I would spring for a better meter if you want more consistent results.
For those that may be wondering, the first meter I bought is a CMI CP66L. It's a logging meter with a wire attached finger clip. It's been pretty cool seeing my numbers from wearing it each night. I've found some eye opening data with it already, like the fact my pulse rate routinely drops to mid 40s at night! The EKG unit wont be here until next week. It's a bit of an all in one monitor that does EKG, Oximeter, blood pressure, temperature, etc. Once I try it out a few nights, I'll report back if it's worth its salt..