7. FAQ's and Knowledgebase / Turbidity

Are Hach StablCal Turbidity standards NIST traceable?

Q: Are the StablCal or Gelex Turbidity Standards manufactured by Hach traceable to NIST ?

StablCal standards set
StablCal turbidity standards by Hach are a gel standard to offer a longer shelf life and safer, simpler alternative to traditional Formazine liquid standards

A: No – NIST does not carry turbidity standards, so no standards for turbidity will be NIST traceable.

However, using Formazin and StablCal as per Hach’s method 8195 is accepted by the EPA as a primary standard to be used in the calibration of turbidity instruments.

All of the raw materials used by Hach to make up the standards are NIST traceable.


For more information on turbidity measurement and calibration, follow the links above or contact us;