Hach Amtax sc CAL2: Standard solution 500 mg/L NH₄-N (1.9 L), MR3: 10-1000 mg/L NH₄-N

The Hach company produces and sells analytical instruments and reagents that are uses to test the quality of water and other liquid solitions. Hach systems are manufactured and distributed worldwide and simplify analysis by offering online instruments, portable laboratory equipment, prepared reagents, easy-to-follow methods and technical support. Hach is headquarterted in  Loveland, Colorado.