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

• Bottle is hermetically sealed to prevent any air (CO2) from entering and causing a change in the pH buffer value. When the bottle is opened for the first time it is as fresh as the day it was produced in our factory.

Each bottle marked with lot number and expiration date.

• Hanna buffers are specially formulated to have an expiration of 5 years from manufacture for an unopened bottle.

This pH 4.01 buffer solution is dyed red for easy identification

• Easy to identify which buffer is being used for calibration