There are different measuring devices used for different fields of radiation. Be mindful that you are using the right one!

Lower Frequencies:

~electric field meter: electrical appliances, electric blanket, TV, power cords, and other electronic devices

~magnetic field meter or Gauss meter: fuse box, high voltage power lines, halogen lights, dimmer switches, all appliances like refrigerator, hair dryer, stoves, alarm clocks

Higher Frequencies:

~RF Meter: baby monitor, microwave ovens, cellular phones, hand-held PDA’s, all wireless devices, ¬†fluorescent lights

Highest Frequencies

~Geiger counter or scintillation counter:  X rays and gamma rays