For use in calibration of pH meters Every unit from 1.0 to 12.00 pH In 500 mL bottles

Chemical Formula: Mixture (Carbonate) Appearance: Clear, colorless solution Tolerance: ±0.02 Traceability: NIST Traceable pH at 25°C: 9.98-10.02 Storage:  +15°C to +30°C Expiration date: Exp. 12 months