Here’s something you might find useful if you are interested in your pulse and blood oxygen levels (and don’t have a suitably equipped smart bracelet). For under £12 sterling, this handy device from GearBest might just do the trick. https://goo.gl/rUD87b
Simply pop in a finger and press the button. The gadget works in all 4 orientations and gives clear, bright readings, uses 2 AAA batteries and claims 2-3% accuracy, more I think than some smart bracelets.
How about continuous reading and a handy bar graph in the middle.
The unit works over a wider range of temperature than I do. And no, it doesn’t poke any holes in you. I had no idea my blood oxygen levels varied so much. I just happened to pop into the house do demo to my wife and as it happened a nurse friend of ours was over and explained the effect that deep breathing has on this. Now I can actually take live measurements it is a lot less abstract than before today. Good gadget.