Needle detection is done to check whether there are any broken needles in the accessories or garments during the manufacturing process that can cause injury to consumers, particularly to children,Advanced metal detectors that utilize multiscan, multi-frequency, technology were able to detect the sewing needle in all orientations. However, be aware that metal detectors may produce different results depending on size and the reaction within the electromagnetic field.The metal detection wand has two basic parts: a Transmitter Coil that creates an EMF, and a Receiver Coil that detects other magnetic fields. To find metal objects, the Transmitter Coil creates an EMF that extends around 8 inches (20cm) from the wand, and the wand is then passed over a person's body.

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