Feature: 1. Support measurement triode, field effect transistor, diode, resistor, capacitor, inductance, capacitor ESR test function (capacitance test should be discharged first to avoid damage). 2. With 128x64 Chinese LCD screen, the measurement results show clearly and intuitively, which is convenient to use. 3. The ATmega328 microcontroller has stable performance and can be used for a long time. 4. Automatic detection of PNP and NPN bipolar transistors, N, P channel MOSFET, JFET, diode, double diode, thyristor thyristor. 5. One-button operation, automatic power off, can measure the current amplification factor of bipolar transistor and the threshold voltage of emitter junction. 6. Transistors can be identified by high threshold voltage and high current amplification factor. 7. Supports two resistance measurements and symbol display, up to four digits and unit display. The resistance symbols displayed are connected to the probe number of the tester (1-3). 8. The resolution of resistance measurement is 0.1 ohm, and the maximum measurement value is 50M ohm. 9. A capacitor can be detected and measured with up to four digits and unit display. The value can range from 25 PF (8 MHz clock, 50 pFat 1 MHz clock) to 100 mF, and the resolution can reach 1 pF (at 8 MHz clock). 10. It can measure the equivalent series resistance (ESR) capacitance of capacitors above 2UF value. Resolution is 0.01 ohms and display two-digit values. 11. Zener diodes can be detected if the reverse breakdown voltage is less than 4.5V. This will be shown as two diodes, which can only be determined by voltage. The symbols around the diode are the same. In this case, you can identify the real anode of the diode by the threshold voltage near 700 mV. 12. Bipolar transistors can also measure the reverse capacitance of a single diode by connecting the base to the collector or emitter. 13. Capacitors with values below 25 PF are usually undetectable, but can be connected in parallel with a diode or at least 25 PF capacitor. In this case, you have to subtract the value of the shunt capacitor. 14. Resistance below 2100 ohms measures inductance if your ATMEGA has at least 16K flash memory. The range will exceed 20H from 0:01 mH, but the accuracy is not good. The measurement results show only a single component connection. 15. The test time is about two seconds. Only capacitance and inductance measurement will take a long time. The software can set the number of measurements before the power automatically closes. 16. Built-in self-check function and optional 50Hz signal check clock frequency accuracy and waiting for call. 17. The measurement of the internal resistance and 0 offset self-check capability of the calibration port output of the optional device requires a capacitor from 100nF to 20uF connected to compensate the offset voltage of the analog comparator between pin 1 and pin 3. This can reduce the measurement error of capacitors above 40uF. Using the same internal correction voltage reference voltage of the capacitor, it was found that the internal reference voltage was adjusted to measure the ADC gain. 18. If the test current exceeds the maintenance current, thyristors and bidirectional thyristors can be detected. But some semiconductor thyristors and bidirectional thyristors have higher trigger currents than the current provided by the tester. Specification: Condition: 100% Brand New Item Type: Transistor Tester Material: Plastic Microcontroller: ATmega328 Screen: 128x64 Resistance Measurement Resolution: 0.1Ω Resistance Measurement: Up to 50MΩ Capacitance Measurement Range: 25pf-100mF Capacitance Measurement Resolution: 1pF ESR Resolution: 0.01Ω Package List: 1 x Transistor Tester