Hach 2227066 Buffer Pillows, pH 7.00 (NIST), Color-coded yellow, pk/50
Hach 2227066 Buffer Pillows are used for pH meter standardization.
Each pillow prepares 50 mL of fresh buffer solution.
Color-coded for easy identification.
pH is ± 0.02 at 25°C.
Pack of 50 powder pillows.