To dream of a metal detector for security represents a wish to prevent embarrassing interruptions or alternative choices. Carefully insuring that a situation will safely remain the way you want it to. Careful screening of undesirable intentions. Making others prove to you that they can be trusted completely.
Alternatively, you may feel like you need to be perfectly compliant or safe for someone else. Proving to someone else that you have nothing to hide or can be completely trusted.
To dream of a handheld metal detector for the ground represents a concerted effort to discover something in your waking life that may have been overlooked. Carefully screening for hidden information, ideas, or potential danger that may not be obvious. Efforts being made to find something that nobody else cares about