Amazon Customer 5 Probably the best thing I've ever ordered. Great for testing solar panel maximum current at any voltage, power banks, voltage drops (cable quality) on usb and PD cables, QC chargers maximum power, and several other uses. The readings are extremely accurate and useful. Truly does pull 5.1amps at 5v from some of the strongest chargers. Well worth the money for many uses. This is the original OEM product from the Orginal maker.