Specifications Adopting Volumetric rotary piston principle of measurement, Class C and D grade FEATURES: 1. Volumetric meter, on principle of piston rotation, complies with ISO 4064 Class C or Class D standard 2. High sensitivity, accurate measurement even at low flow rate of 4L/h. 3. Optimum accuracy and performance at all times, in any position 4. Piston adopts high quality material to ensure stable and durable performance 5. Liquid-sealed register, easy and long tem clear reading