Fisher Gemini-3 Metal DetectorFind deep metal object or trace buried pipes and wires. Fisher's two box detector has a reputation for being the best. Goes deeper, & traces farther! Two box treasure hunters know Fisher's Gemini 3 has a reputation for being the best there is. Designed to locate deep objects; depending on ground mineralization and target size objects may be detected as deep as 20 feet! The Gemini 3 goes deeper, traces farther and is easier to use than any other cache