Coralife is one of the market's leading manufacturers of premium aquarium products.;Coralife's Hydrometer takes a true water sample at six inch depth.;Easy to read and accurate, this specific gravity meter is designed to give temperature-corrected readings in warm water aquariums;Cora life is one of the markets leading manufacturers of premium aquarium products;Cora life's Hydrometer takes a true water sample at six inch depth;Coralife is one of the market's leading manufacturers of premium aquarium products;Coralife's Hydrometer takes a true water sample at six inch depth