MasterLink is a Mobile App used for Configuration and Calibration of Electronic Volume Correctors and Cellular Modems used in Gas Metering Solution. MasterLink is capable of connecting to these Metering Instruments Wirelessly using Bluetooth Low Energy as the Technician comes in the vicinity of these instruments and completes all routine maintenance operations with minimal User Interaction. By the time the Technician completes the Physical inspection of the device, routine checks are completed and presented in an intuitive and interactive dashboard. This enables user to quickly determine the overall health status of the instrument in a single screen. MasterLink also supports downloading consumption logs, event logs and alarm logs from the instrument and sharing them via email. There is also a live graphing functionality that lets you monitor critical parameters.