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Ricca Chemical Company 2246-16 Conductivity and TDS Standard, 10 millisiemens per centimeter (10,000 micromhos per centimeter) and 5400 ppm as NaCl, 500 mL is manufactured with the tighest specifications currently available on the market and is intended for calibration of conductivity meters. The specification on Ricca Conductivity Standard, 10 millisiemens per centimeter (10,000 micromhos per centimeter) is plus-or-minus 10 at 25 degrees Celsius. This standard is certified traceable to NIST Standard Reference Material, lot numbered and expiration dated.