Need to cal a Dall tube pressure measurement device, any ideas?

 

Do you know the differential across the tube??
And what device are you using to read the differential.
If you have a choice all industry recomendations suggest against using dall tubes due to the innaccuracy being quoted at about 12%.
Read this doc: http://www.engga.uwo.ca/mechlabs/Hydraulics Lab/Dall Tube/Dall Tube.htm
hope this helps.