TDS Solution (500ml) is a premium quality 1,382 mg/L (ppm) TDS calibration solution that is prepared against a NIST traceable potassium chloride solution. Solutions have the lot number and expiration date clearly marked on the label and are air tight with a tamper-proof seal to ensure the quality of the solution. Specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle.

Premium quality 1,382 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.