Good value in being able to measure magnetic fields, electrical fields, and radio fields.  I used it to measure electrical fields in our new place.  Took it to a lamp store to find lamps with lower electrical fields.  Most modern lamps are fine...if you're in the next room.  Awful lot of electrical energy from lights.  This meter showed me how quickly the fields drop off, so I can estimate how far we have to be from the lamp to be within safe limits.  Meter is not particularly biased as to field direction, so it's easy to detect any field.