SainSmart Portable Component Tester Transistor Diode Triode Capacitance ESR Meter Inductor SainSmart is well known and provides high quality electronics product Automatic test the pin of a component, and display on the LCD Measure the gate and gate capacitance of the MOSFET threshold voltage Can detect the transistor, MOSFET protection diode amplification coefficient and the base to determi Automatic detection of NPN and PNP transistors, n-channel and p-channel MOSFET, diode (including dou