The KCX-017 calculated from current and time and the amount of charge in mAh, and stores them in up to 10 different memory locations. Thus, the power consumption can be roughly as well as the capacity of USB battery packs determine. However, this is not accurate because only current and time are recorded, but not the voltage. However, for the acquisition of the work done we need current, voltage and time. Since the voltage but always should be around and at 5 volts and anyway interest most users only for mAh, which is negligible. In addition, the Kapaziät of battery packs is sometimes given in mAh and as the PortaPow enables direct control without having to recalculate. But voltage indicator, current, space and amount of charges need space on the display and that has gotten very small KCX-017 and at that very point of view depends. The Ezreal KW-203 USB Detector, however, has two large different colored 7-segment displays for current and voltage and is easy to keep these values so that at a glance. But he saves nothing and is not therefore to determine the amount of charge.
About the accuracy of both devices can be argued, because there is a wide variation within a series and even the board layout often changes times. Two almost simultaneously purchased KW-203 USB Detector I had two revisions in hand. In principle it can be said that the parts are quite sluggish and need up to 10 seconds at constant load until the refined value. With a load I have created 2 A current and measured with a precise Uni-Trend UT71D multimeter. It had both subjects ads between 1.94 to 2.07 amps. When the voltage is varied at precise 5 volt input voltage to a counter in the decimal place, wherein the Ezreal KW-203 seems to eject the own output voltage with berücksichtigtem plug resistance, whereas the KCX-017, the input voltage measured without taking into account their own resistance and voltage drop.
For accurate measurements, the two devices are not usable, but for home use is the deviation of a Count at the first decimal place in order. Both monitors are inexpensive, and quite recommendable to speak with a large bi-color display or a small screen with a lot of content to different audiences.
