Features: Boot voltage detection function. Automatic detection of NPN and PNP transistors, N-channel and P-channel MOSFETs, diodes (including dual diodes), thyristors, transistors, resistors and capacitors, etc. Automatically test the components of the pins and display them on the LCD. Can determine the amplification factor and base of transistors, MOSFET protection diodes, etc. to determine the forward bias voltage of the emitter transistor. MOSFET measuring gate threshold voltage and gate capacitance. The monitor uses 12864 LCD (128 * 64 characters). Higher test speed, expiration component test: in 2 seconds (except in larger capacitors, the measurement of large capacitance still takes a long time, the measurement time is 1 minute is normal). One-button operation, boot test. Power consumption: less than 20 nA in off mode. Automatic shutdown function can avoid unnecessary waste, save battery energy and improve battery life. Specification: Printed Circuit Board Size:63 * 71mm / 2.48 * 2.8in Weight: 173g/6.1oz Battery: Power supply for 9V stacked battery. If for long time power supply, it can use 2 lithium battery composition of 8.4v battery as power supply. (Not Included) Package List: 1*Transistor Tester 6*Transparent Acrylic Plate 1*Hanging Rope 1 set of screw