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ProCal Primary Turbidity Standards for HF scientific Turbidimeters

ProCal Primary Turbidity Standards are pre-diluted, factory certified, and ready for use with not only the HF scientific turbidimeter product line but with other manufacturer’s instrumentation. The ProCal no formazin formulation utilizes a preservative that enhances stability, yet is safe and biodegrades rapidly in aquatic environments.


  • Custom NTU values available
  • Greener - safe and non-toxic
  • Can be used with other manufacturer's instruments
  • Easy to use

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific ProCal

Approval Information

For approval information, please refer to the products specification sheet. For any other information on product certification and documentation information, please visit our certification partner websites: