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The GM328A is a versatile all-in-one component tester with an LCD screen. It can automatically identify and test various semiconductors including NPN / PNP transistors, MOSFETs, diodes, SCRs, as well as measure capacitance, resistance, inductance, voltage, and frequency. It also generates adjustable PWM and square wave signals for experimental and testing use. Designed with SMT testing capability, it is ideal for small surface-mount component detection and electronic repair work. Its portable design and wide detection range make it an essential tool for electronic enthusiasts, maintenance technicians, and laboratory use.