Bluelab 4.0 pH Calibration Solution, 20 ml, case of 25 complete-systems Sold in lengths of 500

Sold in lengths of 500 feet per roll

Potassium is a major component in photosynthetic processes

A five position ion level control knob varies the ion output between 50% and 100%

affordable installation in tight spaces

Experienced gardeners know that a perfect outdoor mix is different than a perfect indoor mix

Bluelab 4.0 pH Calibration Solution, 20 ml, case of 25 complete-systems Sold in lengths of 500Calibration and conductivity standard solutions a must in every grower's toolbox. The Bluelab calibration and conductivity standard solutions are essential for use with all Bluelab products for the calibration of pH and testing the cleanliness of the Bluelab Conductivity Temperature probe. Bluelab solutions are manufactured specifically for Bluelab products and are referenced to high laboratory standards to ensure your Bluelab products last longer and