Bluelab pH 4.0 Calibration Solution 500ml Meters In systems using reverse osmosis

In systems using reverse osmosis (RO) water and plants grown in inert media

By growers

Apply up to a maximum of 25 kg per 25 m2 (200 lbs per 1000 ft2) annually

This finely crafted tray is made to help you jump start growth

5 inches (240mm) long

Bluelab pH 4.0 Calibration Solution 500ml Meters In systems using reverse osmosisBluelab pH 4. 0 Calibration Solution pH measuring equipment must be cleaned and calibrated regularly to ensure they are giving the user accurate readings. pH instruments are calibrated to pH 7. 0 first (buffer) then to pH 4. 0 (slope). Calibration Solution should be stored in a cool place out of direct sun and heat. They should be stored with the lids securely tightened.