This 1,382 mg/L (ppm) TDS calibration solution that is prepared against a NIST traceable potassium chloride solution.
Hanna test solutions have the expiration date and lot number noted on the label and has an air tight tamper-proof seal to ensure the quality of the solution.
Hanna's line of TDS solutions expire 5 years from the date of manufacture for an unopened bottle.
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