A very simple to use EMF meter with EMF ranges that can be easily read in the dark.   This is great first time meter or as a back up meter.
 
Features:
 
One click lock button for easy movement with one hand
Measure broadband electromagnetic fields from 50Hz to 20000 Hz
5 color LED indicators, representing different EMF values
 
Specs:
 
Material: ABS
Battery: 9V (not included)
Frequency monitoring: 50/60Hz
Detection range: 0-20 milliGauss
 
Light indication:
Dark green light: 0 1.5 milliGauss
Green light: 1.5 to 2.5 milliGauss
Blue light: 2.5 to 10 milliGauss
Orange light: 10 to 20 milliGauss
Red light: 20+milliGauss