Adafruit USB Charger Doctor - In-line Voltage and Current Meter

This versatile USB Charger Doctor provides precise monitoring for all your USB-powered projects, measuring both voltage and current draw effectively. Its transparent blue plastic shell houses a cutting-edge mechanism that plugs directly into your USB device setup.

Key Benefits:

• Measures working voltage and current output accurately.
• Operates between 3.5-7VDC, handling up to 3A.
• Flips between voltage and current readouts every 3 seconds for convenience.
• Ideal for testing chargers, cables, and cell phones.
• Efficiently checks load levels and aids in debugging battery chargers and boost converters.

The digital display offers instant numerical readouts, using a 0.05 ohm resistor for current measurement. Its simplicity and robustness make it an invaluable addition to any electronics toolkit, perfect for ensuring your gadgets are operating at their optimal power levels. This device may be a bit bulkier than some alternatives, but it provides an unparalleled level of detail in its numerical feedback.