DRF Double-Rotator Flowmeter (Also called Bi-Rotator Flowmeter) is a self research and designed product by Scientific Devices (Bombay) Pvt. Ltd. This series of flowmeter is a new kind positive displacement flowmeter developed specifically to serve as the heart in loading facilities at oil product depots. Contained in measuring chamber are a pair of rotators having special spiral gear teeth, the design of which is responsible for successfully eliminating pulsation in flow stream. The special sands proof and self-lubricant designing can measure sands content and high water contain oil. This type flowmeter has many advantages such as high-precision, high security, smooth running, low noise and long lifetime.