Hand-polished pure copper pen tip, DIY, economical, and affordable Intelligent detection, color screen display 9999 Diverse functions, optional series and parallel measurement modes, can measure quality factor and loss factor Equipped with a large-capacity battery, extended working time, and Type-C charging Three different frequencies: 100Hz, 1KHz, 10KHz Features6: Can test ordinary diodes and distinguish between positive and negative poles, Manufacturer: Akfldms