Bluelab pH 7.0 Calibration Solution 250 mlBluelab pH 7. 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."

White/Black Grow BagsThis update to our classic Hydrofarm grow bags features a new durable white plastic outer layer – so you can write details like plant type

Root Riot™ Plant Starter replacement cubes are pre-moistened so they are ready to use right out of the bag

Trim Fast's advanced action works in two ways: it contains a food grade* lubricant which fills the microporous surface of your cutting blades and creates a smoother

Ceramic shaft

Thermometer: Digital Thermometer

528 GPH thru 1269 GPH models include a 15 ft 120 volt power cord

Available in 4″–20″ all rolls are 25ft

US Patent Pending: 29/446133

Record the date of placement and at the end of four months replace the strip with a new one

all while the Gro-Block Improved maintains its structure

these trays are recyclable

Made in California