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Essentials pH buffer is a known solution of a certain pH value designed to test the accuracy of pH meters and used to measure the pH of a nutrient solution. Essentials buffer use two values of 4 and 7pH to calibrate pH testers as they are at the outer reaches of the range of pH where you work in hydroponics i.e. 5.5-6.5. This product weighs 2.3-pound. Available in 1-quart. Measures 3-1/3-inch length by 3-1/3-inch width by 9-inch height.
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