Hach ProCal Primary Standard for Process Turbidimeter 1720, 1.0 NTU

ProCal Primary Turbidity Standards are formulated to provide instrument-specific accuracy with a safe, non toxic formulation, and offer improvements in stability over polymer and formazin alternatives, two-year shelf life. U.S. EPA-approved to meet NPDES and NPDWR compliance reporting requirements. One 1-L bottle Instrument specific kits and standards ensure maximum accuracy Safe, non-toxic formulations are traceable to Formazin Two year shelf life