The newest apps in the Entity Sensor family.
Use your old Android phone(s) to run the free EntityX
app to connect multiple devices to record these sensors 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 phones.
Records audio for EVP (Electronic Voice Phenomena) analysis.
Records and saves the EMF, temperature, humidity (if available), proximity and light readings to a data file that can uploaded to Google Drive.
See the Entity Sensor 2 page
for more information.