Calibration Standard Set Back Catalog number: 52042 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 44022 EPA Method 601 - Purgeables Mix #2 Price on request 70593 Chlorpyrifos methyl Price on request 83610 Isovaleraldehyde-DNPH, 100µg/ml in Acetonitrile, 1ml Price on request