Nearly all industrial steel detectors are well balanced coil systems. Three coils are wound onto a non-metallic body and every coil is exactly parallel with the opposite two. For those who’re serious about dipping your toe on the earth of underwater metallic detecting, you must Look into Nokta’s “The Legend” https://pulse-induction-metal-det21109.fireblogz.com/60344226/5-tips-about-metaldetector-you-can-use-today