Apera Instruments pH 7. 00 Standard Buffer Solution is made with high-purity chemicals, 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 chart is provided on the bottle label for reference. All the solutions are double-sealed, have a 2-year shelf life, and not subject to the DOT shipping restrictions, and. The expiration date is printed on the bottle. MSDS documents are downloadable. Certificate of analysis can be achieved by request. Keeping the standard solutions fresh and uncontaminated is the precondition for accurate pH measurement. Pour 2-3 oz. of solution into a clean container for calibration. If sealed well, the same amount of solution poured out can be used for 10-15 times before replacement. Never pour the used solution back to the original bottle to avoid contamination. 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. Show more @media (max-width: 768px) { div[style*="column-count:3"] { column-count:2 !important; } }@media (max-width: 480px) { div[style*="column-count:3"] { column-count:1 !important; } }
