General Hydroponics Ph 7.0 Calibration Solution Reviewhttp://tinyurl.com/k3ghkse General Hydroponics Ph 7.0 Calibration Solution General Hydroponics uses the highest quality electronic meter reference solutionsGrowers can use our reference solutions widely among many popular brands of meters using the NaCl scaleGeneral Hydroponics technicians check each batch to ensure that our solutions are exactly calibrated each time they are used
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