27/06/2026
Fisher Gemini-3
Is a specialized two-box RF (Radio Frequency) detector engineered specifically to locate deeply buried caches, large ore veins, and underground utilities. Rather than searching for small nuggets or coins, its dual-box transmitter-receiver design allows it to punch through heavy mineralization and detect large targets at extreme depths of up to 20 feet or more
Operating Frequency: 81.92 kHz (crystal-controlled)Detection Depth: Up to 10 - 20+ feet (depending on target size, orientation, and soil mineralization)Operating Modes: 4 modes (Narrow Scan Inductive, Wide Scan Inductive, Inductive Trace, Conductive Trace)Audio: V.C.O. (Voltage Controlled Oscillator) signal that increases in pitch and volume over the targetPower Source: 16 standard AA batteries (8 in the transmitter, 8 in the receiver)Battery Life: ~ 25 hours for the transmitter; ~ 30 hours for the receiverWeight: 7.5 lbs (3.4 kg)Warranty: 5-year limited warranty