WS Disinfection By-Products - Cal Check 4 Back Catalog number: 93986 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 52026 Alternate Interferents A Price on request 675175 2,6-Dichlorophenol, 100 µg/ml, Methanol, 5ml Price on request 98554 Formaldehyde (0.5 ppm) Price on request