Oximetry is painless but is not as accurate as an ABG. Also, a pulse oximeter does not measure your carbon dioxide level. The oxygen level from a pulse oximeter is reasonably accurate. Most oximeters give a reading 2% over or 2% under what your saturation would be if obtained by an arterial blood gas.
This is good for any age group. I use it on my 3 year old and on my husband. It is also good for the elderly to make sure their oxygen levels are good and high. The older we get the less exercise we get the less oxygen we get in our blood. I would recommend this to anybody who wants to keep their pulse and oxygen in check. I have no dislikes I like this oximeter a lot it is so easy to use and read.