Bluelab pH 7.0 Calibration Solution Size:250ml Once the young plants produce

Once the young plants produce their second or third pair of leaves

for every 1 pH add approx 300g per square meter of Lime

A replacement probe for Bluelab Combo and pH Meters

with emphasis being strongly placed on efficiency and preservation

Once emptied

Bluelab pH 7.0 Calibration Solution Size:250ml Once the young plants produceHigh quality solutions formulated for calibrating pH probes. Bluelab calibration solutions are essential for use with all Bluelab products. Bluelab Solutions are manufactured specifically for Bluelab products and are referenced to high laboratory standards to ensure your Bluelab products last longer and maintain accuracy. The bottles pictured here may look different in some countries.