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The important metal detector features are discrimination, ground balance, target identification, operating frequency, sensitivity & search depth.

Metal detectors based on their purpose & features are categorised as entry level, mid level & high end.

Yes, most manufacturers produce multi-purpose metal detectors that perform two or more specialized functions.

Discrimination is the ability of a detector to distinguish between one target and another. In other words, being able to tell if the signal you're getting is a quarter or a trash item. There are just as many bottle caps and rusty nails in the soil as valuable treasure, so discrimination saves you time digging up garbage. Most detectors either auto

The three main categories metal detectors fall under are land-based coin and relic hunting; beach and underwater detecting and prospecting for gold and other precious metals.

Active ultrasonic sensors emit ultrasonic sound waves that reflect off objects and bounce back to the original emission point. Motion detection cameras, lights, and sensors used in home security systems generally rely on PIR sensors. These detect infrared energy, which humans and animals release as heat.