Digital Tube Display Calculator Production Kit - This kit is composed of specialized circuit boards, digital tubes, microcontrollers, buttons and other components, delivering stable performance and long service life. - Power options: supports Type-C power interface DC5V power supply or button battery power supply. The battery installation port has a hole on the side for easy battery removal. - Functionality: the digital tube display calculator production kit can not only perform addition, subtraction, multiplication and division, but also convert the resistance value of the color ring resistor. It is a multifunctional product suitable for electronics enthusiasts to practice soldering and learn to use. - Applications: suitable for welding practice, electronic training, experiments and other purposes; very suitable for DIY enthusiasts. - Use scenarios: - In classrooms or electronics labs for practicing basic arithmetic and resistor color-code decoding while assembling and testing the kit. - For DIY projects and personal experiments that benefit from a compact calculator display and resistor value converter. - For portable demonstrations or hands-on learning, enabled by Type-C or battery power for on-the-go use.