I can try to give you an approximate figure, but it has to do with the number of pipes. Stations with large volumes can certainly have up to 8 or 10 meters per station. Small stations may have from 2 to 4 meters, as the case may be.
In Quebec, they are not doing only calibration. They are doing all kinds of inspection. However, it costs less than $1,000 per site, on the average. This is because the certified inspector has to come and he must be paid. For calibration, I could not tell you exactly, but I could give you an answer fairly quickly.