From Krugism Development:
The Entity Sensor is an EMF (Electro-Magnetic Field) Detector that uses your phone's built-in magnetic field sensor. This works like the EMF Detectors seen on the paranormal TV shows to find ghosts. Great to measure areas of strong magnetic fields, which can cause a variety of physical problems.
What's new in this version:
Version 3.16 fixed problem with X-Large format screens and changed screen to black.