Check the listing for details. GroLine pH and EC Meters (500 ml) Quick Calibration Solution.. Condition: New. Listed at 39.00 USD. HI5036-050 is a quick calibration solution for use with Hanna's 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. 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. The HI5036-050 is for 500 mL of calibration solution. Hermetically sealed to maintain freshness Two calibration solutions for the price of one Expiration date on label HI5036-050 is a quality quick calibration solution produced in accordance with ISO 3696/BS3978 standards using high purity salts, deionized water, certified weight-checked balances, and Class A glassware in a temperature controlled environment monitored with certified thermometers. Quick Calibration Solution Calibration solution for Gro line pH and EC/TDS meters pH calibration buffer value of pH 6.86 EC calibration standard value of 5,000 μS/cm (5.00 mS/cm) Air tight bottle with tamper-proof seal Ensures quality and freshness of solution Each bottle marked with lot number and expiration date Hanna buffers are specially formulated to have an expiration of 5 years from manufacture for an unopened bottle