Bluelab pH4 Calibration Solution 250ml

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pH 4.0 calibration solutions - a must in every grower's toolbox! Contains 250 ml/8.4 fl oz Boost your pH products’ longevity with regular cleaning and calibration Type: A clean pro be is an accurate probe Bluelab pH Pen Cleaning Instructions Bluelab pH & Soil pH Probe Cleaning Instructions Bluelab Soil pH Pen Cleaning Instructions pH 4.0 calibration solution MSDS Show more