. ..... At first I thought it's broken, after turning herself did nothing for 5 seconds, then came but a display - only the oxygen, then 8 seconds later, the pulse, the values fluctuated widely, the oxygen content appeared to me. high. (I have COPD) Have the unit then shown my pulmonologist, then we have my oxygen content measured in the blood: in fact it was only 87% - but that device displays 96%, that's SCRAP !!!!! I bought the device because there so much advertising is done with and the reviews were so good - you have to read the bad stop also. And then I had to get even a used sent'm certainly not the first to send the thing back. The plastic box was full of fingerprints (is still) but the finger sensor was dirty - hello? I know where the previously had his fingers? I think now hackts !!!!!!!!!!!! Even the finger sensor to work is completely unsuitable, slips down at the slightest movement, the measured values vary greatly, sometimes I have 96 pulse, then pulse 74, then 104 and that pulse at rest. The device is only good for a ton, will return. Only inexpensive it is, but it is good just nothing ..................... actually not even a star worthy.
