Hach standard calibration buffers are available in convenient 3-Pack of color-coded liquids.They are recommended for automatic calibration and assure accuracy (±0.02 pH units)

• 33% Cost Reduction over single bottle purchase
• SOLUTIONS (color-coded) pH is ± 0.02 at 25°C. pH 4.01 (color-coded red) (NIST) 500mL
• SOLUTIONS (color-coded) pH is ± 0.02 at 25°C. pH 7.00 (color-coded yellow) (NIST)  500mL
• SOLUTIONS (color-coded) pH is ± 0.02 at 25°C. pH 10.00 (color-coded blue) (NIST) 500mL