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Review of one of the most popular measuring devices - the LCR T4 transistor tester. What is it for in a home workshop? How often and what exactly will it measure? How does it work as a capacitor tester? Or maybe an ESR meter is enough instead? What is ESR? What is Vloss? Checking field-effect and bipolar transistors, what is Uf? What does the transistor tester not see? IGBT, Triac, thyristor, triac. Diode test, Schottky diodes, LEDs, point diode, dual diode. Zener diode test, the transistor tester cannot test zener diodes with a stabilization voltage above 5 volts. How long does the battery last? How to test SMD? Why reflash? How to use the LCR T4?