- Functionality: This kit can perform basic arithmetic (addition, subtraction, multiplication, division) and also convert resistor color-code values, providing a compact tool for both calculation and resistor value interpretation. - All-in-one learning tool: A multi-functional product ideal for electronics enthusiasts to practice welding and learn how to use the device, combining calculation with resistor value conversion. - Build and durability: Composed of special circuit boards, digital tubes, microcontrollers, buttons and other components, delivering stable performance and long service life. - Power options: Supports a Type-C power interface for DC 5V supply or button battery power. The battery installation port includes a side hole for easy battery removal. - Practical applications: Suitable for welding practice, electronic training, experiments and DIY projects, making it a versatile aid for hands-on learning and small-scale testing. - Target users: Designed for DIY enthusiasts and students seeking a reliable, easy-to-use calculator and resistor value converter in a single kit.