This pH 4.01 calibration solution is NIST traceable and comes with a Certificate of Analysis. The solution has the lot number and expiration date clearly marked on the label and has an air tight, tamper-proof seal. Hanna's line of calibration buffers have been specially formulated to expire 5 years from the date of manufacture for a sealed bottle.

Hanna HI7004L/C Offers

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).

Features

• 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