This welding practice board to improve welding level and speed. Welding skill level standard board, high-strength fire- and anti fall material, can be disassembled and reassembled repeatedly. Suitable for students majoring in electronics and electronics enthusiasts Board size: 80x60MM Board thickness: 1.6mm Communication interface: SPI Power supply voltage: 5V Power supply current: 800mA There are 9 major categories of mount components for matching welding, totaling 110 pieces, and corresponding testing points are set up: 1.Resistance class - packaged as 0805 (20 pieces, all in series, total resistance R1) 2.Resistance class - packaged as 0603 (34 pieces, all in series, total resistance of R2) 3.Resistance class - packaged as 0402 (10 pieces, all in series, total resistance R3) 4.Exclusion type - packaged as 0603 (6 pieces, all connected in series, with test points) 5.Capacitor class - packaged as 0805 (20 pieces, all in series, total capacity of C1) 6.Diode class - packaged as 3216 (10 pieces, all connected in series, with testing point Da) 7. istor class - packaged as SOT-23 (6 pieces, with test points) 8.Integrated chip class - packaged as SO-14 (2 pieces, with testing points) 9.Integrated chip class - packaged as LQFP44 (2 pieces, with testing points) note: Please contact customer service about download or installation information before placing order. Colour:As Shown Material:Electronic components Package Contents: 10 x Welding Practice Circuit Board Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.