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Ideal for use with reverse osmosis water or coco grows
it helps ensure plants stay vigorous and productive from start to finish
100% organic and hormone-free
Built-in fan balancer — set and maintain negative pressure
6amp & 16amp models
Bluelab pH 7.0 Calibration Solution | 250ml pH Meter Calibration Fluid Guanokalong Ideal for use with reverseProduct Features Benefits Contains 250 ml 8. 4 fl oz Boost your pH products longevity with regular cleaning and calibration Improve product longevity with regular calibration. How to calibrate your Bluelab pH products You must develop the habit of routine cleaning and calibration if you want to increase the accuracy and lifetime of your Bluelab pH product. Fortunately, all Bluelab pH meters and pens may be calibrated using the same simple procedure.