EPA Method 502/524 Surrogate Standard #2 Back Catalog number: 19267 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended MA9061 1,413 µS/cm conductivity solution (230mL) Price on request 71066 Thianaphthene Price on request AC-AQ15-015 Aqueous ethanol control EtOH AQ (1.5g/L), 10x1,5ml Price on request