Metal Detector

The Metal Detector is a premium gear that goes in the Right gear slot and does damage to Ground Enemies - so you could pair it with the Sim Chip for farming runs

It boost the coins earned in each room as follows:

Rarity Boost
Common 6.0 %
Uncommon 12.5 %
Rare 19.5 %
Epic 27.0 %
Legendary 35.0 %
Mythical 43.5 %
Exalted 52.5 %
Deluxe 61.5 %

Note that the boost stacks additively with the Bean Counter upgrade, for details on how it works see Earning coins in Runs