The calibration kit includes three 20 mL single-use packs of premium quality pH 4.01 buffer solution, three 20 mL single-use packs of pH 7.01 buffer solution and three single-use packs of 470 mV ORP (Oxidation-Reduction Potential) test solution.

Each single-use packs has the lot number and expiration date stamped on it and is made of light block foil ensuring freshness each time one is opened. Hanna's line of calibration buffers has been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened single-use packs.

• Each single-use packs is color coded label for easy pH buffer value and solution identification
• Accuracy of +/- 0.01 pH @ 25°C
• Instructions and Temperature chart of the actual pH value at various temperatures printed on each single-use packs