Hanna Instruments 1500 mg/L (ppm) TDS Calibration Solution is a premium quality 1,500 mg/L (ppm) TDS calibration solution that is NIST traceable and contained in portable single-use sachets. Each Hanna Instruments 1500 mg/L (ppm) TDS Calibration Solution 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 TDS calibration solutions have been specially formulated to have an expiration of 5 years from the date of manufacture for unopened packaging. HI70442M is a premium quality 1,500 mg/L (ppm) TDS calibration solution standardized with a conductivity meter that has been calibrated with potassium chloride NIST 2202 SRM (Standard Reference Material) in deionized water for analytical use in accordance with ISO 3696/BS3978. Additional equipment used in preparation of the solutions include certified weight-checked balances, Class A glassware and certified thermometers.temperatures printed on each unit
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