Model OF is the oval-gear flow sensor that is compact and does not require any straight pipe length so that it can be easily built in the machines and systems. Fluids including fuels such as kerosene and heavy oil can be measured. Due to its excellent repeatability, it has merits in various applications such as dialysis machine, offset rotary printing machine, electric oven, bread machine, Vending machine for household cleaner, Adblue refilling dispenser for diesel cars, etc.