The newest apps in the Entity Sensor family.
The EntityX Base
app can work stand-alone, and also connect to the free EntityX Remote
app to record the sensor data remotely using Bluetooth.
Use almost any old Android phone(s) with the free EntityX Remote
These additional phones can be placed all over the area you're investigating to read and record data from separate areas.
This data includes EMF, temperature and humidity (if available), proximity and light data to the Base app.
The data from all of the remote sensors is recorded to the data file.
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.