The newest apps in the Entity Sensor family.
Use your old Android phone(s) with the free EntityX Remote
app to record the sensor data remotely. Most older Android phones will work.
These apps use your phone's magnetic sensor (electronic compass) to read the local magnetic field, plus read the temperature and humidity (if available), proximity and light.
Displays and records EMF and other readings of your surroundings and all connected EntityX Remote apps.
The EntityX Base app records audio for EVP (Electronic Voice Phenomena) analysis and can save this data to your Google Drive.
See the EntityX page
for more information.