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This dual range chlorine test kit tests for high and low ranges of chlorine using the Octa-Slide 2 Comparator. Low range: 0.1-1.0 ppm Cl. High range: 1.0-6.0 ppm Cl.
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.