Magnetic sweepers are used to clear small pieces of ferromagnetic material e.g. nuts, bolts and nails.
A ferromagnetic material is a term for anything attracted by a magnetic force. To be ferromagnetic it must contain a element of iron, nickel, cobalt, or gadolinium"
They can remove pieces of ferromagnetic material from workshop floors, fields, or even standing water.
They are very useful in places where tyres are burst frequently due to dropped pieces of ferromagnetic material. This can cost companies a lot of money unnecessarily. and so magnetic sweepers help to avoid this.