Water Quality Testing Kit, Hardness, Range 4 to 200 ppm, Sensitivity 4 ppm, Test System Titrimetric, Number of Tests 50, Replacement Reagents 4EWE5, Includes 15mL Hardness Reagent #5, 15mL Hardness Reagent #6 Solution, 60 ml Hardness Reagent #7, Instructions, Test Tube with Cap
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