Hanna GroLine pH 4.01 Buffer Sachets — 25 × 20 mL

pH 4.01 buffer in single-use sachets — the acidic point for two-point pH calibration, portioned fresh for every use. Hanna's GroLine sachet packaging follows the same naming as its HI70300G storage sachets.

Single-use sachets keep calibration solution factory-fresh — every calibration uses solution that has never been exposed to air or contamination. The light-blocking foil packaging protects against UV degradation, and each sachet is marked with its lot number and expiration date. Box of 25 sachets, 20 mL each.