Bluelab 2.77EC Conductivity Solution 250ML (Case Of 6) 3/8" Shutoff This probe is recommended for

This probe is recommended for use with the HI981420 GroLine Hydroponic Nutrients Monitor for pH

it is advised to maintain clean measuring devices and not pour any unused fertilizer back into the bottle

Better canopy light penetration with diffused light

Zinc Sulfate

Bluelab 2.77EC Conductivity Solution 250ML (Case Of 6) 3/8" Shutoff This probe is recommended forThe 2. 77EC solution is used as a reference or checking solution to ensure you have adequately cleaned the EC ppm probe. Calibration Solution should be stored in a cool place out of direct sun and heat. Please keep out of reach of children. They should be stored with the lids securely tightened.