Check the listing for details. Soldering Practice Board, 2 Set Electronics PCB Board DIY Metal Detector, 3-5V. Condition: New. Listed at 15.46 USD. This metal detector soldering kit electronics practice board is a teaching kit for people who want to improve the welding skills.Specification:Product:Electronic Production Teaching KitApplicable voltage: 3-5VPCB board size: 86*61*1.5mm/3.38*2.4*0.06inchEffect: Metal DetectorPacking List: 2 Set Metal Detector DIY Electronic Experiments Teaching Kit(1Set List: 1 * resistance 470 Ω, 1 * resistance 2K, 1 * resistance 200K, 2 * ceramic chip capacitance 222,2 * 104 *, 2 * 9012, 1 * 9018, 1 * PCB board, 1 * electrolytic capacitor 100uf, 1 * 5mm LED red, 1 * adjustable 100 Ω, 1 * self-locking switch, 1 * terminal, 1 * buzzer , 1 * battery box)Advantage :1. The pcb board prototype kit is tinned, not easy to oxidize, high-strength fireproof, anti-drop material, can be disassembled and assembled repeatedly.2.