pH 4.01 Calibration Solution

HI7004C is a premium 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 +/- 0.01 pH @ 25°C and are traceable to NIST Standard Reference Materials (SRMs).

Air tight bottle with tamper-proof seal
Each bottle marked with lot number and expiration date.
This pH 4.01 buffer solution is dyed red for easy identification