GroLine pH 4.01 Buffer Sachets, 20 mL (25 pcs.) 810666009176 Extended Measurement Ranges:

Extended Measurement Ranges:

5V AA (included)

drinking water

Low power demand for extended battery life (batteries included)

Battery Life: ~100 hours continuous use (batteries included)

GroLine pH 4.01 Buffer Sachets, 20 mL (25 pcs.) 810666009176 Extended Measurement Ranges:HI70004G 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!