I want information about tuv company for inspected meters
Which company of tuv can witness on meters calibration
And why
Because this company have many branch like
Tuv hessen and tuv rehlind and another
If I have ultrsoinc meter for gas and the flow range are (320-10000)m3/h and I calibration in the lab from (320-6400)m3/h. So is that ok or not and why. Because in AGA9 report recommended to do calibration from min.to max.
Can help me plz