Bluetooth low energy, electromagnetically shielded, data logging multi-sensors with (4) highly accurate environmental parameters with (2) unique trigger fields:
 
Temperature (Ambient)
Humidity (Relative)
Pressure (Barometric)
Dew Point (Degrees)
 
Unit Specific Trigger: EMF (Electromagnetic Fields)
 
*See link below for individual sensor specifications.
**Runs on replaceable lithium and alkaline batteries that last several months of continuous use.
**Requires iOS or Android device with Bluetooth connectivity to observe and record data.