[android-developers] How many Teslas you need to get correct magnetic field data

Hello. I'm using the magnetic field in my application and sometimes It doesn´t work properly because It doesn´t get enough Teslas from the magnetic field. So I am doing this to detect the how many teslas the device is detecting, but I don´t know how many it needs:

SensorManager mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);

Sensor magField = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);

Float power = magField.getPower();

Does anybody know another way to know when the device can detect properly where is the north?

Thank you

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