Ampere is a neat piece of software which helps you in the process of finding out if your battery charger works as it should. In case you notice that some chargers do a good job while others don't, you should use this tool to check what's going on. A big advantage is the simplistic and intuitive interface where you have easy access to its main features.
Keep in mind that not all devices are supported by this tool because some of them don't come with the essential technology that makes this tool able to measure amps. Inside the interface you can read information like battery health, current percentage, technology, temperature, voltage, and more. In case your battery is charging at this moment, the application also tells you what's the voltage coming from the power source.
The main reason behind Ampere is to find out which chargers work better for your Android device. The current depends on many aspects, including the actual method used for charging (wireless, USB cable, AC), brightness of the display, running processes, Wi-Fi status, phone type, and more.