pH Buffer Standards

ISO Guide 34 certified pH buffer reference standards (CRMs) are intended to be used for calibration of pH instrumentation. They feature red, yellow, and blue color codes for pH 4, 7, and 10, respectively.  Our pH buffers do not contain formaldehyde or mercury compounds as preservatives or chromium compounds as colorants, so they are safer to use and easier to dispose of than other available products.

Our pH buffers are certified at 25°C, and the values are traceable to NIST SRM's 185h, 186g and/or 191d. Each product is shipped with a comprehensive certificate of analysis (COA), which includes a table of pH values across a range of temperatures.