EPA Method 507 - Performance Check Solution Back Catalog number: 19130 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 672961 Isoniazid, 50mg Price on request L20030300AL PCB-Mix 3, 10µg/ml in Isooctane, 10ml Price on request XA18000323IO Pesticide-Mix 323, -, 1ml Price on request