How to use USB voltmeter 

This video is a quick introduction to how to use the USB voltmeter.
USB voltmeter we use:
POWER-Z for USB-C and ZY1280P for USB-A.
00:01 Introduction
00:23 Detection Tools & Equipment
01:20 How to use a USB voltmeter
03:32 How to save the information of the Voltmeter
04:05 Why the device can not charge or be charged