Amazon.com: NATIONAL GEOGRAPHIC Junior Metal Detector - Adjustable Metal Detector for Kids with 7.5" Waterproof Dual Coil, Lightweight Design Great for Treasure Hunting Beginners : Patio, Lawn & Garden
Monoloop and Coaxial Search Coils
Double-D Search Coils
PDF] Coil Design of Pulse Induction Metal Detector | Semantic Scholar