Despite their limited use for testing wall chargers and power banks, USB inline testers let you compare power sources. In three videos, we take you through their features, and we also try an inline ...

Believe it or not, not all USB ports yield the same amount of power, but here's a $10 gadget that can show you which ones you ...

These are the power meters you should buy for triathlon training and racing, according to our rigourous testing.