Application Measuring the volume of cold potable water passing through the pipeline. Features 1)Integer vane wheel which is scientifically designed and carefully-well manufactured 2)8 digital pointer-roller indicator, low pressure loss 3)low starting flow rate, high sensitive 4)selected high quality materials steady & reliable characteristic easy and clear reading 5)technical data conforms to iso4064 standards b Class Maximum permissive error A)in the lower zone from qmin inclusive up to but excluding qt is f+5%. B)in the upper zone from qt inclusive up to and including qs is f+2% Iso 4064