EPA Method 507 Surrogate Standard Back Catalog number: 19049 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 59823 Conductance @ 20°C [500 µmho/cm] Price on request 96436 SDWA Carbon disulfide, MIBK, Naphthalene Cal 4 Price on request 95716 Method 1005 Window Standard Price on request