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Check the listing for details. LCR -T421 128 Transistor Tester Diode Triode Capacitance ESR Meter MOS/NPN. Condition: New. Listed at 16.48 USD. Automatic detection of NPN and PNP transistors, n-channel and p-channel MOSFET, diode (including double diode), thyristor, transistor, resistor and capacitor and other components. Inductance: 0.01mH-20H.