We recommend that YSI-certified polymer-based standards are used for best results. YSI's polymer-based standards are prepared and labeled so they are traceable to the EPA's primary standard, Formazin Polymer standards from other vendors may not be properly adjusted to meet…

YSI turbidity solutions calibrate your instruments for maximum accuracy. Extremely accurate and stable solutions. We recommend that YSI-certified polymer-based standards are used for best results.