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