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General Hydroponics pH 7.01 Calibration Solution AC Dehumidification Humidification even during adverse conditions Size:digital even during adverse conditions Probe cleaning is one of the most important parts of owning or operating any Bluelab meter allowing growers to calibrate many popular brands of PH 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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