Debug Digital Circuits Faster and Smarter When you are deep into prototyping or troubleshooting a printed circuit board (PCB), constantly shifting your eyes to a multimeter screen breaks your concentration. The 5V/3.3V Digital Logic Test Pen is engineered to streamline your workflow. It provides instant visual feedback right at the probe's tip, allowing you to test logic levels intuitively and efficiently. Intuitive Three-State LED Indicator No more guessing or interpreting fluctuating numbers. This tester uses a straightforward traffic-light system to indicate circuit states at a glance: Red Light (High Level): Indicates voltage above 2.4V (in 5V mode). Green Light (Low Level): Indicates voltage below 0.6V (in 5V mode). Blue Light (High Impedance): Indicates an open circuit or floating voltage (0.6V - 2.4V), a crucial feature for identifying disconnected pins or faulty traces. Built for Convenience and Precision Designed with the maker and engineer in mind, this logic probe features an ergonomic, compact PCB body that feels natural in the hand. The built-in elastic (spring-loaded) pogo-pin probe ensures solid electrical contact without slipping or damaging delicate surface-mount components. Plug-and-Play Compatibility Powered directly via standard DuPont jumper wires, it seamlessly integrates with your existing breadboards, Arduino, Raspberry Pi, or custom development boards. Simply connect it to your board's VCC and GND, and you are ready to diagnose.