This quick calibration solution for use with the GroLine pH and/or EC/TDS meters. Using the Quick Cal function found in compatible meters allows for a single point calibration for pH and/or conductivity sensors. Each bottle has the lot number and expiration date. Each sachet has the lot number and expiration date stamped on it and is made of light block foil ensuring freshness each time one is opened. Calibration solution have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened sachet. Product is for 25 sachets containing 20 mL of calibration solution.