Features: Brand new and high quality Use single chip microcomputer ATMEAG328P DIP-28. The display unit uses a 160x128-pixel color display screen with 8x20 characters, 16-bit color depth, and graphics display component symbols. Rotaries coding switches control, one-touch measurement, automatic shutdown. Use 9v laminated battery to supply power, or use power adapter to supply power. The current of the whole machine is about 30mA, and the current is about 20nA after shutdown. Automatic detection of NPN triode, field effect transistor, diode, double diode, thyristor, silicone controlled rectifier, automatic identification of the above transistor pin distribution. Specifications: Material:PCB Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set GM328 Transistor Tester