Apera Instruments AI1102 pH 4.00 Calibration Buffer Solution 8 oz.

Features:

• High Accuracy (±0.01 pH): standardized against NIST certified pH references within 0.01 pH at 25°C (77°F).
• Ideal for the calibration of all kinds of pH meters/testers
• The Apera Instruments AI1102 pH 4.00 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.
• All the solutions are double-sealed, not subject to the DOT shipping restrictions, and have a 2-year shelf life. The expiration date is printed on the bottle. 

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.