pH 4.01 Standard Calibration Buffer Solution (250ml)

The Apera Instruments pH 4.01 Calibration Buffer Solution is color-coded and standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). It's ideal for the calibration of all kinds of pH meters/testers. Since pH level is affected by temperature, a temperature/pH reference chart is provided on the bottle label for reference. The expiration date is printed on the bottle. MSDS documents are downloadable. Certificate of analysis can be achieved by request.

Note: Store at room temperature and away from direct sunlight. Keep the bottle tightly closed when not in use. Keep out of reach of children.