WS Disinfection By-Products - Cal Check 4 Back Catalog number: 93986 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10406.2-5MG O,O-Dimethyldithiophosphate, sodium salt, 5mg Price on request 679372 Heptachlor-exo-epoxide, 10 µg/ml, Cyclohexane, 1 Price on request 73164 Tetradecanoic acid Price on request