Certified 84µS/cm conductivity solution supplied with certificate of analysis. A premium quality conductivity solution prepared against a National Institute of Standards and Technology (NIST) traceable Potassium Chloride solution and supplied with a Certificate of Analysis. Allows calibration of instruments with a conductivity scale of up to 200µS/cm for the measurement of pure or distilled water. Supplied in a 500mL blue light-block bottle to protect against light exposure.