Difficulties in Differentiating Between Ordnance Items and Other Debris

2 Difficulties in Differentiating Between Ordnance Items and Other Debris 

Even when using the best available technology in metal detectors, a number of factors can prevent this technology from reliably diffa entiating between ordnance items and other debris. 

signal strength is inversely proportional to depth in all metal detectors and magnetometers. Therefore, it is difficult to distinguish between a small metal object near the surface and a larger object that is deeper. Some detectors are better at reading depth than others. 

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