... for universal AC power supply, switch power supplyNeedle Detector NC-B 's Detection HeadWhen detecting metals, with following indication,1) ... impurities in pure Copper, Aluminum, Stainless Steel.SPECIFICATIONS1. Type NC-B(100) 2. Detection Method Magnetic induction3. Detection adjustment ... products shape will effect above standard data.Each Needle Detector NC-B with 1pc fabric cover ( color: black)If ...