USB Current Voltage Charging Detector

Plugged it between my charger and phone and instantly saw the real voltage and current—no extra cable needed, which is exactly what I wanted. For the price, it’s a solid little tool for anyone tinkering with USB power.

Finally, a way to see what my phone is actually pulling instead of guessing—this little plug-in tells me the voltage and current live, and it's so small I just leave it on my keychain. No extra cables or power supply to fuss with, which makes it a no-brainer for any DIY bench setup.

I plugged this into my phone charger and it showed the voltage dropping when I added a second device — exactly what I needed to test my power bank. The display is clear and updates fast enough to see changes in real time.