NIST-Traceable pH Buffers

Economical, ACS-grade pH Buffers are traceable to NIST.

Each Buffer features a temperature conversion chart on its label and comes with biogradeable dyes for quick and easy visual detection.
Ready-to-use calibration standard. pH Buffers are color-coded for easy identification. Calibrate your meter per the manufacturer’s specifications. Always use a fresh Buffer to calibrate and do not pour unused standard back into the bottle for risk of contamination. Buffers 4.00 and 7.00 are manufactured to measure with ±0.01 pH at 25°C. Buffer 12.45 measures within ±0.01 pH at 25°C.