EMF Detector is an instrument that measures fields of less than 1 millitesla (mT) and gaussmeter is used for those measuring greater than 1 mT.
EMFs (electromagnetic fields) are usually measured in milligauss (mG).

EMF Radiation Detector is measuring electromagnetic field around you in milligauss gauss and microteslas.

EMF Radiation Detector works based on the magnetic sensor of your mobile device. EMF Radiation detector is as accurate as the sensor on your device.