Inferential Type Dry Dial, Multi Jet, Magnetic Transmission. Straight Reading Cyclometer Type register for the most comfortable reading position of 7 rollers & 2 pointers. Only one moving part - the impeller - in contact with the water for minimum wear & utmost reliability. All the materials in contact with water, consciously selected by the known resistance to corrosion. Wide Range of products 15mm to 50mm.