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The Transistor Tester user manual. Power：. Transistor Tester can be powered from 6.8V – 12V DC. This can be achieve by a 9V layer-built battery. Two 3.7V. The screen will show self test mode, the 2nd line will show ? Mark. Push the start button again quickly and Calibration will start. 3) When screen shows T4 LCR-T4 12864LCD ESR SCR Meter Transistor Tester. Features: Powered by 9V layer-built battery, can use 2 li-ion batteries to form a 8.4V battery pack forLCR-T4 Component Tester. The LCT-T4 measures components, including resistors, potentiometers, inductors, capacitors, diodes, dual.