This is a simple EMF app that measures Electromagnetic Fields, and it vibrates if the value rises over 420. This to help people that have a spinal cord stimulation equipment operated into their spine to prevent neuropathic pain, to be warned if the surrounding EMF is exceeding high values.
High values can turn the stimulation on or off.
Or Very high EMF can cause tissue damage or worse.
This app can also be used as is, just to measure surrounding EMF.
Do remember that this is only a measurement, it can not prevent any damages or injuries. To find out more about spinal cord stimulation, contact a manufacturer of such equipment or your doctor.
The app can show both micro Tesla and milli Gauss.
Also base values can be set to zero, earth min value or reset this to use real time value.
There is an data window that shows what sensors are in the phone,
and a detailed measurement window that shows values from all available sensors.