Turbidity Standard (400 NTU) Back Catalog number: 54122 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 79894 Tetrachloro-m-xylene Price on request 11703.12-100-IO 2,3',5,5'-Tetrachlorobiphenyl ,100 µg/mL,isooctane,1mL, Price on request 680789 Spirotetramat-enol-glucoside, 10.0 µg/ml, Acetoni Price on request