Mastech MS8232B is a digital multimeter designed for various electrical measurements. It features automatic and manual ranging, allowing you to quickly and easily obtain accurate readings. The device can measure AC/DC voltage, AC/DC current, resistance, capacitance, frequency, and duty cycle. Additionally, it has a diode test function and a continuity buzzer for testing diodes and checking for continuity in circuits. The non-contact AC voltage detection function provides a convenient and safe way to detect the presence of AC voltage without making physical contact with live wires.