pH 4.01 calibration solution manufactured in accordance with ISO 3696/BS3978 standards using deionized water, high purity salts, certified weight-checked balances, and Class A glassware in a temperature controlled environment monitored with certified thermometers. Reported values are traceable to NIST Standard Reference Materials (SRMs).
- Supplied with Certificate of Analysis
- Color coded label for easy pH buffer value identification
- Solution does not contain any dyes that may stain the reference cell of a pH electrode