Every time I see one of these in a catalog I look at them. Their merit with freshwater aquariums - especially those using a sponge prefilter or canister media is noted. But with a max reading of 500 gph and unknown wear with use - does an aquarium flow meter like this have a place in the saltwater aquarium world?
More info:
Monitoring Aquarium Filtration Systems: GPH Flow Meter by Tom Oscar Aquarium Products