Klein Tools ET920 USB Digital Meter, USB-A and USB-C is a USB digital meter for both USB-A and USB-C ports. It accurately and reliably measures and displays the USB port voltage, current, capacity, energy and resistance simultaneously. It can function with any USB-A and most USB-C ports that have the ability to deliver power. It does not require batteries as it draws power from the port under test. The ET920 can store and recall up to 10 readings. This model is designed to test both standard USB-A as well as the latest USB-C technology.