Bluelab 4.0 pH Calibration Solution, 20 ml, case of 25 grow-light-ballasts The ExHale 365 comes with

The ExHale 365 comes with separation seal that doubles as a hanger after activation

• Easier & faster to calibrate

Because some states recognize only the acid-insoluble method

This gives you a buffer on the watering times but still allows you to feed regularly without over watering

Bluelab 4.0 pH Calibration Solution, 20 ml, case of 25 grow-light-ballasts The ExHale 365 comes withCalibration 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