EDL21 Control is an iPhone app developed by Marius Montebaur. It falls under the category of Utilities & Tools and is available for free. This app aims to simplify the cumbersome operation, especially the pin entry, of digital power meters with an optical interface.

With EDL21 Control, users can easily enter the pin code on their iPhone, hold the iPhone close to the meter, and unlock the meter. This eliminates the need for manual pin entry on the meter itself, making the process much more convenient.

One of the notable features of this app is the ability to store multiple pins. This is useful for users who have multiple meters to manage. Additionally, EDL21 Control offers customization options for different types of meters, allowing users to adapt the app to their specific needs.

In the event that a user forgets the pin for a particular meter, EDL21 Control can also assist in retrieving it. This feature adds an extra layer of convenience and ensures that users can always access their meters without any hassle.

Overall, EDL21 Control provides a user-friendly solution for managing digital power meters with optical interfaces. Its intuitive interface and helpful features make it a valuable tool for anyone dealing with these types of meters.