Electro-Magnetic Field Testing measures the strength of low-level electro-magnetic fields in your home. Knowing where such "hot spots" are allows us to avoid spending too much time in their presence.
DIAGNOSTIC TESTING -
Electro-magnetic fields (EMFs) are present wherever electric wiring is present. Homeowners are often unaware of spots in their home where these fields occur. Thus, it is not unusual to discover a baby's crib placed inside opposite the spot where electrical wires enter the house on the outside. Similarly, people often sleep for 1/3rd of their lives with their head inside the electro-magnetic field generated by the small transformer of a clock radio or on the other side of the wall from an indoor circuit breaker panel.
Checking the home with an EMF meter detects such locations. It can be argued that EMFs are not harmful - just as it could not be proven that cigarette smoking was causally linked to lung cancer. However, it might be prudent to avoid spending a lot of time with your head in one of these fields.