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pH 4.0 calibration solutions - a must in every grower's toolbox


Type: A clean probe 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


  • Contains 500 ml/16.9 fl oz 
  • Boost your pH products’ longevity with regular cleaning and calibration 

BlueLab Calibration Solution pH 4.0 500ml

Out of Stock