Calibration Standard Mix 4 Back Catalog number: 52046 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 678352 Tefluthrin, 100 µg/ml, Ethyl acetate, 1ml Price on request 676722 trans-Urocanic acid, 100mg Price on request 79326 tert-Butyl hydroquinone (TBHQ) Price on request