We have one that we bought at the Miami Boat Show. The Tank Tender water gauge that came with the boat doesn't work worth a hoot, in large part because the aft tank feeds the keel tank and also because, well, it doesn't work worth a hoot.
We have been very happy with the Water Counter. We spend a lot of time on the hook or moored. It helps us understand what different chores or appliances (dishwasher, clothes washer) really use. You can manage consumption very closely. It has an odometer cumulative meter right on the measuring unit; very "industrial". We actually have not got around to hooking up the LED counter, since I log the cume reading everyday while I am in the engine room anyway. I'll get "around to it" sometime, I suppose.
Regardless, one of the better gadgets we've got. Nice folks, too.
George
"Incentive" 1981 56MY
currently en route to The Thimbles from Norwalk.