This welding practice kit is easy to assemble and has a simple principle. Connections on the PCB are clearly mapped and labeled. The soldering time is 2-3 hours, suitable for DIY electronic enthusiasts, and can be used as a school or home education practice kit. But please note that this electronic soldering kit requires certain basic electronic theoretical knowledge as well as soldering and hands-on skills. (1) Basic arithmetic operations, with decimal point and negative numbers. (2) 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. (3)Convert between decimal and hexadecimal. (4) Measure the LED current limiting resistor. (5) Square root operation. Improve your soldering skills with this electronic engineering kit, designed to help you make a practical desktop calculator. With a 1602 LCD screen that clearly displays numbers and large buttons that prevent you from clicking the wrong , this DIY calculator kit is the perfect companion for studying and working. Note: When not used for a long time, it automatically enter power saving mode. Electronics soldering project kit designed for school soldering practice and home education. This DIY kit not only improve your soldering skills, but also deepen your familiarity with electronic components and expose you to fascinating electronic . Highly recommended to students and home enthusiasts., Manufacturer: I500703578