As others have mentioned, simple pulse oximeters are much cheaper ($20-50). But pulse oximeters w/ connectivity are generally more expensive. The Nonin 9560 O

As others have mentioned, simple pulse oximeters are much cheaper ($20-50). But pulse oximeters w/ connectivity are generally more expensive. The Nonin 9560 Onyx 2 is probably the best known (BT 2.0) - the best price I could find online for that was $340. The MedChoice MD300C318T (BT) I found online for €199 (~$267). These are the two models that are compatible w/ apps like <a href="http://simpleeye.com/platforms/android/bluetooth-pulse-oximeter/>SimpleEyes http://simpleeye.com/platforms/android/bluetooth-pulse-oxime... Android app</a>. However, there is a cheaper alternative - the Contec CMS-50E (USB) and apparently a new CMS50EW that also has Bluetooth, can be bought for around $85. I haven't tried the wireless version, but the USB version works well, w/ good community support (<a href="http://ian.ahands.org/progs/pulseox/>reverse http://ian.ahands.org/progs/pulseox/>reverse engineered protocol</a>) and can be run continuously. For those interested in actually having/using this type of data, I'd really recommend this over the Tinke, since it doesn't give you access to your data at all (and of course, is limited to connecting to older iOS devices) and generally looks to be just gimmicky. Lastly, I recommend taking a look at the Wikipedia article to learn more about <a href="http://en.wikipedia.org/wiki/Pulse_oximetry>pulse http://en.wikipedia.org/wiki/Pulse_oximetry>pulse oximetry</a>. While Tinke is using it as some sort of overall health diagnosis, it's really most useful for diagnosis of things like sleep disorders (like OSA) or other types of hypoxia (or monitoring for that). I'm pretty doubtful about it's usefulness for monitoring overall health, although it's fun to play with (watch your SpO2 drop as you hold you're breath, wee!)