BlueLab Calibration Solution - 4.0 pH Size:250 ml purified water and a food-grade

purified water and a food-grade thickener

epoxy-potted

Can be used to grow any crop varieties

140-series cloner (1-5/8 inch neoprene inserts) + 1 x 140 model's dome

You can use these with any of your favorite growing media

BlueLab Calibration Solution - 4.0 pH Size:250 ml purified water and a food-gradeThe Bluelab Calibration Solutions are a very necessary part of a growers toolbox. These solutions are manufactured specific to the calibration process and referenced to high laboratory standards by Bluelab. They are required for the calibration of pH meters, pH monitors and controllers. Regular cleaning and calibrating of pH measuring equipment ensures accurate readings. Bluelab's EC CF equipment does not need calibrating, as they are all factory