one key measurement operation, auto power off delay. Shutdown current is only 20nA, support for battery operation. Automatic detection and NPN bipolar transistor, N, P-channel MOSFET, JFET FET, diodes, two diodes, thyristors, resistors, capacitors, inductors. Automatic detection pin definitions. measuring the current amplification factor (B) of the bipolar transistor and the turn-on voltage of the emitter junction (Uf). Darlington transistor amplification factor can be identified by the high voltage and high current. can detect bipolar transistors and MOSFET's internal protection diodes and displayed on the screen. measuring the voltage and the gate capacitance of the MOSFET. Support two resistance measurements, the potential can be measured. If the potentiometer is adjusted to end, the tester can not distinguish between the middle and the ends of the pin. resistance measurement resolution is 0.1 ohms, the maximum value of 50M ohms measurements. capacitance measurement range from 25pf to 100mF (100000 UF). Resolution up to 1 pF, inductance measurement range 0.01MH-20H, otherwise it will appear as a resistor, inductor DC resistance is higher than if Europe 2100 will also be displayed as a resistor. it can detect 2UF above capacitor equivalent series resistance, a resolution of 0.01 ohms. This feature is very important for the detection of the capacitor performance. it can display symbols of the two diodes in the right direction, also shows the forward voltage drop. LED detection for diode forward voltage drop higher than normal. Dual LEDs detected as double diode. Simultaneous detection of light-emitting diodes will flash. time for each test is about two seconds, only the capacitance and inductance measurements will take a long time. Power Supply: 1 x 3.7V Lithium Battery(no including battery) Colour: Material:PC+Metal Package Contents: 1x MG328 Transistor Tester (no including battery) 3x High test Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.