Standardized and certified traceable to NIST Standard Color-coded for quick reference Accuracy ±0.01 pH at 25°C pH temperature chart, lot numbers and expiration dates on each label pH 4.0 buffer is colored red, 7.0 buffer is yellow or green and 10.0 buffer is blue.…

Formula: Mixture Description: Potassium Acid Phthalate, Mathanol and Butylparaben in Water, with red coloring