Field Detector Survey Meter, ELF – 20-2000 mHz
![](https://www.ergonomicsusa.com/wp-content/uploads/2013/05/FD1-640x520.jpg)
Measures both magnetic and electric fields in the VLF frequency range. 3-axis system for magnetic fields. Easy to use.
Measures both magnetic and electric fields in the VLF frequency range. 3-axis system for magnetic fields. Easy to use.