Saltwater Meter for massive water changes

[TheReefOdyssey]

I am tasked with helping a large Saltwater livestock distributor measure the gallons of water being drained and filled throughout a dozen systems. Luckily we've already plumbed a dozen massive systems into 1 fill and 1 drain line. I'm looking for advice on the best "saltwater proof" meter out there in 1.5" inch or possible 2" PVC. The ones I'm seeing on Amazon seem to be aluminum. I could get it down to 1" or 3/4 inch, just dont want to hinder flow too much. Any feedback from pros would be appreciated.

Kind regards,

Chris

 

[Gumbies R Us]

@Troylee

 

[SantaMonica]

The "best" material for reefing would probably be titanium, which you can find with "titanium flow meters with 1" pvc inlet and outlet"