It is important to regularly check for possible electromagnetic leaks from microwave ovens. Excessive leakage can be a problem and even become a danger to health. This Faithfull detector can be used to verify any leak from microwave ovens and other sources within a few minutes. The detector's analogue display will clearly show if an electromagnetic field leak is present. The Green sector indicates that the product is safe, the Red sector warns that a leak is present which could be harmful to humans. The detector may also be used to check other items that generate an electromagnetic field such as mobile phones and cameras.