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HI5004-R is a premium quality pH 4.01 technical calibration buffer made from high purity salts and deionized water for analytical use according to ISO 3696/BS3978, using balances checked with certified weight and Class A glassware, in a temperature-controlled environment checked with certified thermometers. Reported values are accurate to +/- 0.01 pH @ 25°C and are traceable to NIST Standard Reference Materials (SRMs).
The HI5004-R is supplied with Certificate of Analysis
Mean lot value
SRMs that were used
Color coded label and dyed solution for easy pH buffer value identification