What flow meter is more accurate for measuring hydraulic oil?

It is more accurate to use oval gear flowmeter for precise measurement of hydraulic oil medium.

Famitsu Oval Gear Flowmeter Hydraulic oil, including measuring the flow of heavy oil, crude oil, diesel, fuel and other oil products, can be accurately measured using the oval gear flowmeter. The oval gear flowmeter is characterized by being suitable for high-viscosity media. It is necessary to precisely measure a small amount of liquid with low resistance (pressure loss), and a small amount of rotation when the gear rotates extremely slowly can still give a sufficient number of pulses. 

Oval gear flowmeter is a type of volumetric flowmeter. It has a large range, high accuracy, small pressure loss, strong viscosity adaptability, and can measure high temperatures. High viscosity liquids and many other advantages. It is suitable for flow measurement work in industrial sectors such as chemical industry, petroleum, medicine, electric power, metallurgy and food.