title: why there is a difference in the magnetic values taken by different smartphones?
body: <p>I need to record the magnetic data in the same surface by two smartphones. </p>
  
  <p>I find different values of the magnitude of magnetic field knowing that I put my smartphones in the same place end the same height. The magnetometers are <code>YAS532(sensitivity 0.2µT/LSB, Measurement Range ±1200 µT )</code> and <code>AK09911(sensitivity  0.6µT/LSB, Measurement Range ±4900  µT )</code>. </p>
  
  <p>Why the results are different while magnetic field is known to be constant and stable? How can I correct the values using the parameters of the magnetometers?</p>