Upgrade your soldering skills with an electronic engineering kit designed to help you make a practical desktop calculator. This DIY calculator kit features a clear acrylic shell and large buttons to prevent you from clicking the wrong buttons, making it an Perfect companion for studying and working. All components are through-hole soldered, with clearly mapped and labeled connections on the PCB. Soldering time is 1-2 hours, suitable for DIY electronic enthusiasts and beginners. But please note that this soldering kit requires a certain basic knowledge of electronic theory as well as soldering and hands-on skills. Assembling the key requires a little patience. (1) USB or button battery powered, easier to operate (2) Basic arithmetic operations with decimal point and negative numbers. And can be calculated continuously. (3) Measure the resistance value of the four-ring or five-ring resistor and enter the color of the color ring to obtain the resistance value. This feature is designed to help you calculate resistor values without a voltmeter, perfect for people interested in electronic components. After the welding is completed, you will get a complete sense of accomplishment, which is the charm and fun of DIY! This DIY kit can not only improve your welding skills, but also deepen your familiarity with electronic components and allow you to Learn about fascinating electronic concepts. Electronics soldering project kit for school soldering practice and home education. The package comes with paper instructions, you can assemble step by step according to the pictures and text, which will greatly improve your welding efficiency. Start exploring the world of STEM technology today and see what you can create ! Material: Metal colour: As shown Package Contents: 4 x soldering project kit