Features: It can test 74ch series, osmo series, cd4000 series, hef400 series, 4500 series, operational amplifiers, interface chips, optocouplers, automatic transistor identification, and voltage regulator voltage identification. It integrates more than 1,300 types of chip data models and more than 420 types of transistor data models. Covers most common devices within 24 feet, which can greatly reduce maintenance workload and improve work efficiency. You can choose different test modes according to your needs: 5v mode, 3.3v mode and automatic mode. Automatic shutdown function: After 60s of no operation, the machine will automatically shut down.