... oil,diesel etc. flow rate means Positive Displacement Roots Flowmeter Flow meter,Oil Counter for oil,petroleum,chemical,fuel oil ... tanker and vessel, combustion engines, mechanical transmission lubricant system, metrological calibration Technology Parameter:Nominal diameter (mm): DN15~100Accuracy: ±0.2%,± ... to customers' optionTechnical standard: JB/T9242-1999 positive displacement flowmeter Flowmeter