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Innovating Science pH 7 Buffer Solution - Ph Up and Down - Ph Calibration Solution Kit - Ph Buffer Calibration Solution - General Hydroponics & Lab Chemicals, Yellow 500mL Ph Kit workwarehouse Firefighter's Radio Holder fits forInnovating Science pH 7 Buffer Solution Ph Up and Down Ph Calibration Solution Kit Ph Buffer Calibration Solution General Hydroponics & Lab Chemicals, Yellow 500mL Ph Kit Ensure precise pH calibration with the Innovating Science pH 7 Buffer Solution Kit, perfect for hydroponics and lab use, containing pH Up and Down solutions in a 500mL yellow bottle for accurate results every time. The buffer is made with potassium phosphate and sodium hydroxide to