EBay This buffer value is widely used in water purification plants, in the food industry, and wherever the pH is expected to be slightly acidic. Traceable to NIST standards Available in bottles or sealed sachets, complete with or without a certificate of analysis. Multiple resolutions for better accuracy. NIST Traceability Standardized using a pH meter calibrated by means of two standard solutions prepared from NIST standard reference materials. Color Coded Solutions An added dye makes it easy to tell which pH buffer you are using.  Certificate of Analysis A Certificate of Analysis (COA) is available for each batch of buffer solutions. Supplied or available on request. Lot Information The production batch number and expiration date are reported on all calibration solutions. Safety Data Sheets Safety data sheets for all solutions are available at hannainst. Com or upon request. Reference Temperatures Provided with a label presenting a reference table of the relationship between pH or conductivity values and temperature. Choose Your Series HI7000 Series (Standard) Basic buffers that suit most users Certificate of Analysis (COA) on request Accuracy of ‚±0.01 PH @ 25‚°C HI5000 Series (Technical) Best for routine lab analyses Supplied with Certificate of Analysis Accuracy of ‚±0.01 PH @ 25‚°C HI6000 Series (Millesimal) Best for increased accuracy in the lab Supplied with Certificate of Analysis Accuracy of ‚±0.002 PH @ 25‚°C Bottles Air-tight bottle with a tamper-proof seal of freshness to ensure quality. Opaque bottle reduces light exposure that could alter the buffer value. FDA Approved Bottles Air-tight bottle with a tamper-proof seal of freshness to ensure quality. Opaque bottle prevents light exposure that could alter the buffer value.