This model comes with a 10” DD waterproof searchcoil. 10” is a usually considered a large size, but it’s right within “standard” that is generally accepted as a good balance between depth and sensitivity. It’s great for covering a good size area without compromising on detection depth and detecting a broad range of targets. Its DD design also allows for better detection in mineralized soil and target separation. The TreasurePro is also compatible with the Coinmaster series of searchcoils.