Logic Probe Tester Pen

Logic Probe Tester Pen – 5V/3.3V Level Detector & Digital Circuit Debug Tool

This compact logic probe pen is an essential tool for debugging digital circuits, providing instant visual feedback on logic states. It supports both 5V and 3.3V logic levels, allowing you to quickly identify high, low, and high-impedance (tri-state) conditions on microcontroller pins, ICs, and PCBs without the need for a multimeter or oscilloscope .

✅ Specifications:

Power Supply: 5V or 3.3V DC (via DuPont wire or alligator clips)

Logic Thresholds (5V Mode): High > 2.4V, Low < 0.6V, Tri-State 0.6V – 2.4V

Logic Thresholds (3.3V Mode): High > 1.49V, Low < 0.39V, Tri-State 0.39V – 1.49V

Input Impedance: ~100kΩ – 1MΩ (prevents circuit loading)

Min Detectable Pulse Width: ~25ns – 30ns

LED Indicators: Red (High), Green (Low), Blue or Yellow (Pulse / Tri-State)

Probe Tip: Flexible, spring-loaded pogo pin for reliable contact

Dimensions: ~102mm x 15mm (pen-style)

Weight: ~5g – 45g (varies by model)

📦 Features:
✔️ Three-state LED display for High, Low, and Tri-State detection
✔️ Supports both 5V and 3.3V logic families – switchable
✔️ Pulse detection and pulse memory (latching) for capturing brief signals
✔️ Pen-style design – comfortable to hold and easy to probe tight spaces
✔️ Overvoltage protection on input (up to ±220V on some models)
✔️ Compatible with Arduino, Raspberry Pi, ESP32, TTL, and CMOS logic

📦 Applications:
✔️ Debugging I/O pins and verifying logic levels on microcontrollers
✔️ Testing digital ICs, logic gates, and flip-flops
✔️ Checking clock signals, bus activity, and pulse trains
✔️ Troubleshooting communication lines (I²C, SPI, UART)
✔️ Circuit education and electronic prototyping
✔️ Fast go/no-go testing in repair and R&D