The UT658DUAL is a second generation USB tester capable of inspecting USB chargers, portable power sources, USB type A/C cables and other electronic charging devices. The tester measures output voltage, current, energy, capacity, circuit equivalent resistance, D+ and D- voltages of USB data cables. The tester is designed to be precise, reliable, stable, and portable. They are great tools for applications such as manufacturing verication, engineering testing, and DIYers.