Mastech MAS838 is a digital multimeter that offers a wide range of measurement capabilities for electrical and electronic applications. It can measure AC/DC voltage, AC/DC current, resistance, diodes, temperature, and continuity. The device features a 3 1/2-digit LCD display, data hold function, and overload protection. It's compact and portable, making it ideal for field or benchtop use. Whether you're a professional electrician, a DIY enthusiast, or a student, the Mastech MAS838 is a valuable tool for various electrical testing and troubleshooting tasks.