How to identify the calibration error in under ground storage tank

The retail outlet dealers always have dispute with tank lorry crew for quantity certification based on the under ground tank reading. There are chances that the calibration of under ground tank is not correct or does not hold good. This video describe the process to identify the calibration error and ways to correct it.

Видео How to identify the calibration error in under ground storage tank канала Praveen Vishwanath Varma