title: Android SDK - measure EMR (electromagnetic radiation)
body: <p>What is the best way to measure the <strong>electromagnetic field</strong> using the smartphone sensors?<br>
  Should I use the magnetometer? (<strong><code>TYPE_MAGNETIC_FIELD</code></strong>).<br>
  My aim is to measure the electromagnetic field generated by wi-fi networks, cordless phones, etc. (frequencies from about <strong>800 to 2.2 GHz</strong>).<br>
  I googled a lot but I don't found a valid answer.<br>
  Thanks</p>