Apera Instruments, AI4201, TN400-S1 Standard Calibration Solution Set (0.02, 20.0, 100, 800 NTU)
Standard Calibration Solution Set for Apera Instruments TN400 Portable Turbidity Meter.
Reagecon high-molecular polymer turbidity standard solutions (0.02 NTU, 20.0 NTU, 100 NTU, 800 NTU).
U.S. EPA certified, non-toxic, accurate, and easy to use. They have evident advantages compared to traditional Formazin standard solution, which are highly toxic and inaccurate.