• Buffer solutions are prepared according to precise formulas and are standardized with a ph electrode and meter calibrated with NIST standards.
• Hanna buffer solutions are prepared using very pure chemicals, in closely controlled laboratories, and with ph meters calibrated with NIST references.
• In order for you to be certain of the accuracy of your instruments over time, ask for Hanna solutions in FDA approved bottles which meet the FDA standards that protect the solutions from extended exposure to light . Hanna solutions that are FDA approved will be listed as FDA.
• For operators who request it we provide standard solutions complete with certificate of analysis. These certificates are prepared against NIST standards to avoid any possible error in determining the actual ph value. The use of these certified Hanna solutions adds a further factor of accuracy to your most critical measurements.Hanna solutions that  have Certificate of Analysisis will be listed as COA.

The most versatile and common solutions are listed here for your convenience. If you don't see the solution that fits your need there are many more types of packaging and sizes of calibration solutions available. Many of the solutions are also available in FDA bottles or come with Certificate of Analysis.  Please contact us toll free at 1-800-240-5570 and our friendly courteous staff will be happy to assist you locate other calibration solutions that are also available for purchase.