COD Calibration Standard Back Catalog number: 50241 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 54156 WP Total Hardness Price on request H669500 Homovanillic Acid, 50mg Price on request 72480 Trinexapac-ethyl, 1000µg/ml in MeOH, 1ml Price on request