Looks like it retails at $600. I wonder if they account for your line length, e.g. pull enough aquarium water through the inlet tube to make sure you are not testing water that’s been sitting in the tube. They say to place it within 4’ of your tank. And do they include a strainer for the inlet tube, or how do you prevent copepods, etc from getting sucked in? Can you run two inlets to one Trident? It would be a shame if they didn’t think of letting you test water from 2+ tanks using the infrastructure of one unit. If not, guess you just have to move your inlet tube between two adjacent tanks manually. Or bring the water you want tested to the Trident.