Need Flow-meter or solution to Test Multiple Hydraulic Pumps

[RyanPatrick]

I have a problem where I am testing multiple hydraulic pumps on one test stand. The pumps' flow ranges from 4 cim (cubic inches a minute) to 900 cim. I usually spec out a Max Machinery flow-meter, however, they don't have one that will encompass my flow range and I would have to use two flow-meters in parallel and valve over. Does anyone know of a flow-meter that can capture these flows? Or, a solution, such as flow amplification (which at first to me seemed very difficult as each pump has it's own reservoir of oil so amplifying this would dump more oil into the pump after it runs through the system which is undesirable).

Any solutions or tips to get me going would be much appreciated! Thanks.