This is a 2024 logic test pen designed for both high and low level testing of digital circuits. It supports 5V and 3.3V digital circuits, delivering accurate debugging of logic states. Ideal for electronic production and prototyping, helping you quickly identify circuit faults and confirm proper operation. Easy to use, streamlining circuit debugging workflows and reducing troubleshooting time. With reliable performance, it is a dependable tool for digital circuit debugging in 2024. use scenario 1 In microcontroller board development, verify IO levels and transitions between 5V and 3.3V devices. use scenario 2 During prototyping or production testing, spot miswiring, stuck at faults, and unexpected logic states on breadboard circuits. use scenario 3 Inspect serial interfaces such as I2C and SPI to confirm high and low level activity across devices.