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This test strip is calibrated at 0, 25, 50, 100, 150, 200, 250, 300, and 350+ ppm, and gives results in just seconds. Packed in moisture wicking bottle, protecting the strips from the elements Instructions and color chart printed directly on the bottle so you never lose them Can be used to test Molybdate, a common corrosion inhibitor in the water treatment industry Proudly made in America