Application Measuring the volume of cold potable water passing through the pipeline. Features A)integer vane wheel and magnetic drive, scientifically designed and carefully well manufactured B)numerical wheel register and pointer indication C)magnetic drive, dry dial D)easy long term clear reading E)long work life F)low pressure loss G)the most popular water meter type in the world H)technical data conforms to class b of the iso4064 standard 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%. Iso4064 b class