GH pH 4.01 Calibration Solution

Regular price $9.03 Sale price $6.26 Save $2.77
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Only 100 items in stock!
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.