• 39824
  • Call for availability



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


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.