The Power Monitor is a small monitor module that plugs in between the USB Power Modules from MyMakerTools and your application. The BLE connection provides a constant reading of the voltage and current on all of the voltages (12VDC, 5VDC or VUSB, 3.3VDC, 2.5VDC and 1.8VDC). The app provides all the control functions and will keep a record of the voltage and current. The module has a 32Mbit memory on board for operating in the stand alone mode and the app will download this data and convert to a CSV file or chart it on the phone. You can record up to 65000 records, which is over 18 hours at a 1 second rate. Visit www.mymakertools.com for a datasheet. Icon courtesy of wallpaperfx.