GroLine pH 4.01 Buffer Sachets, 20 mL (25 pcs.) 67016 4 packs of 2 certified

4 packs of 2 certified Alexapure filters (8 filters total)

First use: Prime filter by discarding first bottle of water to activate alkalinity enhancement

IP67 Waterproof: Fully submersible

and press READ

GroLine pH 4.01 Buffer Sachets, 20 mL (25 pcs.) 67016 4 packs of 2 certifiedHI70004G 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!