I did a little research and discovered that difference is that valves used for hydroponic use are measured in volume, not in pressure. The valve probably isn't quite as accurate because it's made to fill areaa much, much larger than a tank. I canceled the order and ordered the Premium. I'm glad you made the comment. I might have been very upset when I got the regulator and discovered it wasn't ideal. You even saved my 10 bucks. The counter that comes with it is a plastic HOB but they do sell a brass and glass one that fits on the valve so I'll get it at another time. I'll work with the HOB in the mean time.