You can use the VertiGIS FM Energy app to scan QR codes that have been entered into the VertiGIS FM database and affixed to meters in the field. When the QR code is scanned, the app displays a list of assets associated with the barcode.
To use the barcode scanner, tap the QR code icon on the dashboard.

QR Code Icon
The scanner opens.

QR Code Scanner
Point the meter so that the scanner is focussed on the QR code. You do not need to push any button. The scanner parses the QR code as soon as it detects it in the camera frame.