GroLine pH 4.01 Buffer Sachets, 20 mL (25 pcs.) special-order 450 CFM fan with 6-inch

450 CFM fan with 6-inch duct for outgoing air (bottom duct)

A replacement probe for Bluelab Combo and pH Meters

so it is best to be added to solution prior to other nutrients - or diluted before adding to a nutrient solution

Can be used from seedling to harvest

Measures pH and temperature

GroLine pH 4.01 Buffer Sachets, 20 mL (25 pcs.) special-order 450 CFM fan with 6-inchHI70004G is a high quality pH 4. 01 calibration buffer designed with hydroponics, aquaponics, and greenhouses in mind. Single use sachets are highly portable, with a small footprint and a lightweight design. They are the perfect accessory for your on the go testing, fitting easily into your pocket or carrying case. Supplied with Certificate of Analysis Single use sachets for convenience. Perfect for use with GroLine testers and portable meters!