Method 1640 Tuning Standard Back Catalog number: 53147 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 59826 Anions Mix Price on request 677071 Imidacloprid guanidine hydrochloride, 10 µg/ml, M Price on request 70058 Di-n-butyl phthalate Price on request