GroLine pH 4.01 Buffer Sachets, 20 mL (25 pcs.)

The GroLine pH 4.01 Buffer Sachets deliver lab-quality calibration packed into ultra-portable, single-use foil packets. Crafted with high purity ingredients under stringent ISO standards, each sachet guarantees accuracy within ±0.02 pH at 25 °C. Traceable to NIST standards and supplied with a Certificate of Analysis, these sachets are ideal for hydroponics, aquaponics, greenhouse setups, or field work. Their light-blocking foil packaging preserves solution integrity, while individual lot and expiration labeling ensures freshness and traceability. Compact and lightweight, they easily fit into pockets or instrument cases—ready for accurate calibration wherever you go.