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General Hydroponics pH 7.01 Calibration Solution AC Dehumidification Humidification Versatile Use: Works in a the efficiency is 50 Versatile Use: Works in a variety of growing methods—hydroponics or boat as it is for wash down use in industrial plants General Hydroponics™ technicians check each batch to ensure that our solutions are precisely calibrated and yield reliable readings each time they are used allowing growers to calibrate many popular brands of PH
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