The main work scene is to apply surface and volume Thresholds on the highest number for diamagnetic metals salt metal especially gold and silver and the best situation in the main work scene is to find the highest surface threshold number for diamagnetic metals salt metal especially gold and silver and volume and in the main work scene even with two Threshold values of surface and Size close to each other with a fixed VDI number it shows a range or has a similar and common answer it is an error and this process in the main work scene for metals Like gold and silver or diamagnetic metals salty metal it is very important that two surface and volume threshold numbers close to each other do not respond to the same range in the main work scene and if two surface and Size Threshold numbers jointly respond to a point and range The desired target does not exist in that range and the error is the ground and the desired target especially gold and silver or diamagnetic metals does not exist in that range and the detection of the ground fault is with the operator or user in determining and changing the settings