It is not a joke or a hoax, the iPhone is able to measure the body temperature through the phone's camera and a special application, actually not new, called, in fact, Cardiograph . The Tdel Cardiograph app is not free, but it costs just 1 Euro, an absolutely sustainable price that I recommend spending, especially because it works very well.
The iPhone does not have a temperature sensor, therefore, those who developed the application have used a trick already experimented with the app that measures the beat and heart rate, applying it for a purpose certainly more useful in these times, i.e. measure fever .
The measurement will not be as perfect as that of a thermometer, but it is very close to it, still giving an indication of the state of health.
The Cardiograph for iPhone is used by resting the index finger of the hand (horizontally) on the camera lens for 20 or 30 seconds so that the sensor can count the heartbeats.
The first measurement is done when you are comfortable, to have a basic heart rate value that can then be compared with future measurements.
Depending on the speed of the beats, it is able to calculate the body temperature and therefore allows you to know if you have a fever or are well.
The app also keeps the measurements taken in memory and creates different personal profiles to be used by the whole family.
Trying the app, which to exclude any responsibility for any errors describes itself as " ... for fun ", we find that, if used correctly, it almost always takes us, even if sometimes counting one or two tenths more.
It is obvious that the app cannot replace the normal medical thermometer, but it can always be useful when you are out, to have a basic indication when you feel unwell, a little hot, with an uphill fever.
