As of April 1, 2022, HF Scientific has added a 8% surcharge for all of their products. The surcharge will appear as a separate line item on each sales order.
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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.