What is Threshold in the concept of a Magnetic Metal Detector? It is different from a Frequency Metal Detector or a Frequency Detector and the Threshold in a Frequency Detector whose circuit is designed according to the principles of Low Frequency Radar is to Detect the level of the field reflected from the Targets, and the level and volume or Surface and Size the Threshold Adjustments  (settings) in each type of Detector Frequency has different uses compared to determining the VDI Number in Edit and Detecting the Main Target or Gold and Silver from similar fields and similar fields are the flow of combination and conversion of Energy and Radiation of Minerals or other Metals or sources that can reflect Pseudo Targets the Main or Gold and Silver or the desired Metal that shows itself similar to the main Target that the Surface and Size or volume Threshold in such a situation that isolates the field similar to or Quasi Target to the Main Target in the reflection so that any type of disturbing field can be isolated from other sources Detected by changing the Surface and Size Threshold in proportion to the VDI Number in the Edit and this condition in the level and volume or Surface and Size Threshold is specific to Frequency Detectors according to Radar principles and this type of level and volume or Surface and Size Threshold function is one of the applications of the level and volume or Surface and Size Threshold Adjustments  or settings related to Surface and Size or level and volume.