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

HI70004G is a high quality pH 4.01 calibration buffer produced in accordance with ISO 3696/BS3978 standards using high purity salts, deionized water, certified weight-checked balances, and Class A glassware in a temperature controlled environment monitored with certified thermometers. Reported values are accurate to +/- 0.02 pH @ 25°C and are traceable to NIST Standard Reference Materials (SRMs).

Each sealed sachet holds just the right amount of solution making every sachet as fresh as the day it was packaged!

Solution does not contain any dyes that may stain the reference cell of a pH electrode.

Light block foil packaging

Light-tight packet helps to prevent against degradation by UV light.

One-time use sachet packets

Ensures quality and freshness of solution.

Each sachet marked with lot number and expiration date

Many Hanna solutions are specially formulated to have an expiration of 5 years from manufacture for an unopened sachet.