the PCB is likely the culprit

Treasure Diving

Garrett Pro-Pointer AT Z-Lynk Wireless Waterproof Pinpointer with Holster

TreasureHound Coil: Designed for deep detection of larger objects buried at greater depths

Comfortable headband and ear cushions for long wear

Fisher Gold Bug Pro Compact Coil Edition High Sensitivity Metal Detector Bundle With 2 Coils Type_Super D the PCB is likely theFisher Gold Bug Pro Compact Coil Edition (GOLDBUG PRO CC) The Fisher Gold Bug Pro Compact Coil Edition is a high accuracy gold prospecting detector engineered to locate the smallest gold nuggets in difficult, mineral rich ground. Operating at a powerful 19 kHz frequency, this detector delivers exceptional sensitivity to fine gold while remaining lightweight, stable, and easy to operate. Key Features Of The Fisher Gold Bug Pro CC High Sensitivity 19