Select up to 3 products
This kit measures for acidity by using the phenolphthalein endpoint. Range/sensitivity is 1 drop = 0.1 or 1.0% (as the particular acid).
The Model AR-42 has the same test range for pH, Hardness, and Iron as the AR-02, but it also is equipped to test for Sulfide (0.2-20 ppm). Includes 50 tests for pH, Hardness, and Sulfide; 100 tests for Iron.