Here is a handy power meter that lets you test cables and chargers to avoid damaging your gadgets by accident. The Satechi USB-C Power Meter measures voltage of your USB Type-C port, current and power input to your device over time and displays the results through its bright display. You will be able to charge your devices and monitor power simultaneously.
The power meter has a voltage range of 4-20V. It measures the power draw of your laptop and can help you identify faulty cables.