The standards have a guaranteed one-year shelf life even if you've opened the bottle and happened not to have recapped it tightly.

The convenient submicron polymer suspensions are non-toxic primary calibration standards approved by the US EPA for drinking water analysis for turbidity.

AMCO Clear® is the unique, non-toxic low-level turbidity standard that can reliably read from 0.02 NTU to 10,000 NTU every time.

*Store at room temperature. Never freeze.

TN400-S1 AMCO Polymer Calibration Solution Set for TN400 Turbidity Meter

Standard Calibration Solution Set for Apera Instruments TN400 Portable Turbidity Meter

AMCO Clear® turbidity standard solutions (0.02 NTU, 20.0 NTU, 100 NTU, 800 NTU).

AMCO Clear® is an EPA approved primary standard for calibration of turbidity sensors that is safe, non-toxic and disposable. It is easy-to-use with no dilution or resuspension, and it is available in a wide range of values.