The gFlow accurately measures how much gas you have consumed. Without EVC, consumption is often an estimate. The gFlow then converts the volume of the gas under operating conditions to volume under standard conditions, correcting for pressure and temperature differences. The metering company receives this data for processing. This is very accurate, so there can be no dispute about whether you are paying too much or too little.
For more information and downloads visit the special gFlow page https://gflow.nl/en