Bluelab pH 4.0 Calibration Solution- 250ml Emerald Harvest range There is a round earth

There is a round earth pin on both male and female ends of the cord

It is not a base nutrient

LEDs will indicate conductivity

Water pump

healthy root expansion and reduced transplant stress when plants are moved between growing environments

Bluelab pH 4.0 Calibration Solution- 250ml Emerald Harvest range There is a round earthIt is recommended that pH instruments are cleaned and calibrated at least monthly to provide you with the most accurate reading. pH measuring equipment is calibrated to pH 7. 0 first (buffer) then to pH 4. 0 (slope). Essential for use with all Bluelab pH products for the calibration of Bluelab pH Probes. To ensure solutions remain accurate: Avoid cross contamination Decanter into a smaller plastic cup Discard sample after use Store in a cool dark