WP Total Hardness Back Catalog number: 54597 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 678276 Chlorthal-dimethyl, 100 µg/ml, Acetonitrile, 5ml Price on request 50712 Medical Marijuana Heavy Metals Calibration Price on request 689104 D6-Dimethachlor Metabolite CGA 369873, 100µg/ml in AL, 1ml Price on request