The detector should be able to find both ferrous and non-ferrous metals

Sensitivity should be adjustable and capable of detecting very small metal objects such as a paperclip or a razor blade

The scanning area should be large, roughly the length of a human hand or slightly more

It should operate at a high frequency suitable for precise metal detection

Alerts should include sound, vibration, and a visible light indicator

The battery should last a long time, enough for continuous use over multiple days

Power can come from either a rechargeable battery or a standard replaceable one

The detector should respond immediately when it finds metal

It should be able to function in both cold and hot weather conditions

The device should be lightweight and easy to hold for extended periods