General Hydroponics pH 4.01 Calibration Solution
General Hydroponics pH 4.01 Calibration Solution - 1 Quart is backordered and will ship as soon as it is back in stock.
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General Hydroponics™ uses the highest-quality reference solutions, allowing growers to calibrate many popular brands of PH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics™ technicians check each batch to ensure that our solutions are precisely calibrated and yield reliable readings each time they are used.
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General Hydroponics pH 4.01 Calibration Solution
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