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This great DIY Kits is for a great welding practice plate to enhance your experience and unparalleled inspiration. The left and right 3 columns of components are used to practice welding, and each column has test points. The back side of the circuit is also used, with a ruler to facilitate the measurement of components. After welding, just connect electricity (3-12V) to see the effect. You can quickly judge the welding effect. Water lamp circuit, PCB size 85.6mm(L)x 54mm (W) x1.6mm (H).