| Oakton (WD-35653-01) pH 4.01 Pouches 20/Box |
 Standardized against NIST standards, premixed, and ready to use. Pouch contains 4.01 pH water used as a calibration solution. "Singles" are convenient for high-precision calibration on-the-go. All Oakton pH buffer solutions are freshness dated, and standardized against NIST-certified references to ensure quality. �0.01 pH at 25�C. Specifications Ideal for field calibration. NIST traceable materials. �1% accuracy at 25�C. Price: 48.20 |