Purchased meter to measure EMF in residential homes.The meter has two scales with a red line to show "unsafe" levels above 3 milligauss. The suggested safe level is approximately 2 milligauss per the internet.Difference in readings on the two scales indicate accuracy of +/- 10%. As the meter has 3 coils it automatically measures the maximum field in any orientation. Most appliances produce a significant field which rapidly decreases with distance. In most cases EMF is at a safe level at 3 - 4 feet from the appliance.I found the meter very useful as it confirms that we are exposed to strong EMF when using cell phones or cordless phones. Homes located next to high voltage powerlines have significantly higher EMF, even well away from any appliance.The meter is sensitive enough to locate hidden wires inside walls or under the sidewalk.I consider the manufacturer's product description to be true.