HI9828-27 is a quick calibration solution for use with Hanna’s HI9829 series multiparameter meters. Using the Quick Cal function found in compatible meters allows for a single point calibration of pH and conductivity, making it ideal for fieldwork. Each gallon bottle has the lot number and expiration date stamped on it and has an air tight top with tamper-proof seal to ensure quality. Hanna’s line of calibration solutions have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle.