USB-C Power Delivery (PD) can supply up to 100 W, making ordinary chargers a flexible power source for makers. The challenge: it’s not easy to see what voltage is negotiated, how much current flows, or how stable the supply is. This project offers two open-source tools: • Power Meter – a compact device with OLED display for instant readings of voltage, current, and power. • PD Logger – Wi-Fi enabled, serving a web interface with live values and long-term plots directly in your browser. Both share the same core: a PCB with USB-C connectors, measurement circuitry, and a microcontroller (STM32 with display, or ESP-01s with Wi-Fi). All design files—schematics, PCB layouts, 3D cases, and firmware—are on GitHub. PCBs can be ordered from JLCPCB, and the enclosures are ready to 3D-print. With these tools, a USB-C charger turns into a real lab companion.