 The 35cm "DOUBLE D" coil Recognised by it's 2 coil cables- a world novelty, for pulse induction detectors. Separate transmitters and receivers inside, send continuous target information, improving the reliability of target identification on screen. Until now pulse induction detectors had a limited time of pulse transmitting and receiving, and poor receiving signal, because their "single" coils had to switch between transmitting to receiving phases with time delay on every phase.
|  The 1m X 1m frame coilComparable to the small round coils the frame coil increases detection depth, small metals/single coins are not detected. Usefull when a bigger, hidden in greater depth target is needed to be found. Cable coils of 8m and 12m perimeter are available for "do-it-yourself" construction on a pvc tube frame, of deeper 2m x 2m and 3m x 3m frame coils. The target detected by a frame coil can be pinpointed in accuracy with a round coil.
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